Standardize section capitalization

This does not (yet) apply to files, but may later

docs/en/020_Getting_Started/020_Download_and_Installation.md

@@ -32,7 +32,7 @@ sudo chown -R www-data:www-data "/usr/share/arsse"
 sudo chmod o+rwX "/usr/share/arsse"
 ```
 
-# Next Steps
+# Next steps
 
 If using a database other than SQLite, you will likely want to [set it up](Database_Setup) before doing anything else.
 

docs/en/020_Getting_Started/050_Configuration.md

@@ -1,4 +1,4 @@
-# The Configuration File
+# The configuration file
 
 The Arsse looks for configuration in a file named `config.php` in the directory where it is installed. For example, if The Arsse is installed at `/usr/share/arsse`, it will look for configuration in the file `/usr/share/arsse/config.php`. It is not an error for this file not to exist or to be empty: The Arsse will function with no configuration whatsoever, provided other conditions allow.
 
@@ -14,7 +14,7 @@ The configuration file is a PHP script which returns an associative array with k
 
 The `config.defaults.php` file included with copies of The Arsse contains an annotated listing of every configuration setting with its default value. The settings are also documented in more detail below.
 
-# List of All Settings
+# List of all settings
 
 ## General settings
 

docs/en/025_Using_The_Arsse/010_Managing_Users.md

@@ -4,7 +4,7 @@
 
 This section describes in brief some CLI commands. Please read [the general notes on the command line interface](index) before continuing.
 
-# Adding Users
+# Adding users
 
 When first installed, The Arsse has no users configured. You may add users by executing the following command:
 
@@ -19,7 +19,7 @@ $ sudo -u www-data php arsse.php user add "jane.doe"
 Ji0ivMYqi6gKxQK1MHuE
 ```
 
-# Setting and Changing Passwords
+# Setting and changing passwords
 
 Setting's a user's password is practically identical to adding a password:
 
@@ -34,7 +34,7 @@ $ sudo -u www-data php arsse.php user set-pass "jane.doe"
 Ummn173XjbJT4J3Gnx0a
 ```
 
-## Setting and Changing Passwords for Fever
+## Setting and changing passwords for Fever
 
 Before a user can make use of [the Fever protocol](/en/Supported_Protocols/Fever), a Fever-specific password for that user must be set. It is _highly recommended_ that this not be the samer as the user's main password. The password can be set by adding the `--fever` option to the normal password-changing command:
 

docs/en/025_Using_The_Arsse/020_Importing_and_Exporting.md

@@ -4,7 +4,7 @@
 
 This section describes in brief some CLI commands. Please read [the general notes on the command line interface](index) before continuing.
 
-# Importing Newsfeeds from OPML
+# Importing newsfeeds from OPML
 
 It's possible to import not only newsfeeds but also folders and Fever groups using OPML files. The process is simple:
 
@@ -14,7 +14,7 @@ sudo -u www-data php arsse.php import "user@example.com" "subscriptions.opml"
 
 The importer is forgiving, but some OPML files may fail, with the reason printed out. Files are either imported in total, or not at all.
 
-# Exporting Newsfeeds to OPML
+# Exporting newsfeeds to OPML
 
 It's possible to export not only newsfeeds but also folders and Fever groups to OPML files. The process is simple:
 
@@ -40,7 +40,7 @@ The output might look like this:
 </opml>
 ```
 
-# Managing Newsfeeds via OPML
+# Managing newsfeeds via OPML
 
 Not all protocols supported by The Arsse allow modifying newsfeeds or folders, et cetera; additionally, not all clients support these capabilities even if the protocol has the necessary features. An OPML export/import sequence with the `--replace` import option specified, however, makes any kind of modification possible. For example:
 

docs/en/025_Using_The_Arsse/030_Keeping_Newsfeeds_Up_to_Date.md

@@ -6,7 +6,7 @@ In normal operation The Arsse is expected to regularly check whether newsfeeds m
 
 There are many ways to administer daemons, and many schedulers can be used. This section outlines a few, but many other arrangements are possible.
 
-# As a Daemon via Systemd
+# As a daemon via systemd
 
 The Arsse includes a sample systemd service unit file which can be used to quickly get a daemon running with the following procedure:
 
@@ -21,7 +21,7 @@ sudo systemctl enable --now arsse
 
 The Arsse's feed updater can then be manipulated as with any other service. Consult [the `systemctl` manual](https://www.freedesktop.org/software/systemd/man/systemctl.html) for details.
 
-# As a Cron Job
+# As a cron job
 
 Keeping newsfeeds updated with [cron](https://en.wikipedia.org/wiki/Cron) is not difficult. Simply run the following command:
 
@@ -38,7 +38,7 @@ And add a line such as this one:
 
 Thereafter The Arsse's will be scheduled to check newsfeeds every two minutes. Consult the manual pages for the `crontab` [format](http://man7.org/linux/man-pages/man5/crontab.5.html) and [command](http://man7.org/linux/man-pages/man1/crontab.1.html) for details.
 
-# Appendix: How Often Newsfeeds Are Fetched
+# Appendix: how often newsfeeds are fetched
 
 Though by default The Arsse will wake up every two minutes, newsfeeds are not actually downloaded so frequently. Instead, each newsfeed is assigned a time at which it should next be fetched, and once that time is reached a [conditional request](https://developer.mozilla.org/en-US/docs/Web/HTTP/Conditional_requests) is made. The interval between requests for a particular newsfeed can vary from 15 minutes to 24 hours based on multiple factors such as: