docs: uppercase the title of our Markdown docs

docs/CODING_STYLE.md

@@ -1,4 +1,4 @@
-# Coding style
+# Coding Style
 
 - 8ch indent, no tabs, except for files in `man/` which are 2ch indent,
   and still no tabs.

docs/RELEASE.md

@@ -1,4 +1,4 @@
-# Steps to a successful release
+# Steps to a Successful Release
 
 1. Add all items to NEWS
 2. Update the contributors list in NEWS ("make git-contrib")

docs/UIDS-GIDS.md

@@ -1,4 +1,4 @@
-# Users, Groups, UIDs and GIDs on `systemd` systems
+# Users, Groups, UIDs and GIDs on `systemd` Systems
 
 Here's a summary of the requirements `systemd` (and Linux) make on UID/GID
 assignments and their ranges.

docs/index.md

@@ -7,13 +7,13 @@
 * [Control Group APIs and Delegation](https://systemd.io/CGROUP_DELEGATION)
 * [The systemd Community Conduct Guidelines](https://systemd.io/CODE_OF_CONDUCT)
 * [Code Quality Tools](https://systemd.io/CODE_QUALITY)
-* [Coding style](https://systemd.io/CODING_STYLE)
+* [Coding Style](https://systemd.io/CODING_STYLE)
 * [Contributing](https://systemd.io/CONTRIBUTING)
 * [Porting systemd To New Distributions](https://systemd.io/DISTRO_PORTING)
 * [Known Environment Variables](https://systemd.io/ENVIRONMENT)
 * [Hacking on systemd](https://systemd.io/HACKING)
 * [Portable Services Introduction](https://systemd.io/PORTABLE_SERVICES)
-* [Steps to a successful release](https://systemd.io/RELEASE)
+* [Steps to a Successful Release](https://systemd.io/RELEASE)
 * [What settings are currently available for transient units?](https://systemd.io/TRANSIENT-SETTINGS)
 * [Notes for Translators](https://systemd.io/TRANSLATORS)
-* [Users, Groups, UIDs and GIDs on `systemd` systems](https://systemd.io/UIDS-GIDS)
+* [Users, Groups, UIDs and GIDs on `systemd` Systems](https://systemd.io/UIDS-GIDS)