Revise headings and usage instructions in README

Updated section headings and clarified usage instructions for XML and git changelog.

Author: hannesa2

README.md

@@ -8,7 +8,7 @@
 This library provides an easy way to display a change log in your app.
 Without take care to VersionCode is necessary when you auto generate the VersionCode
 
-## Usage of a XML
+## A: Usage of a XML
 
 1. Create the master change log in `res/xml/changelog_master.xml`. Formatted like this:
 
@@ -31,8 +31,8 @@ Without take care to VersionCode is necessary when you auto generate the Version
 2. Create translations of this `changelog_master.xml` file in files named `changelog.xml` under
 language-specific versions of `res/xml/`, e.g. `res/xml-de/changelog.xml`.
 
-## Usage git changelog
-To generate a git changelog, grouped by tag you can run `getTagGroupedGitlog` `from git submodule buildSrc/src/main/kotlin/info/git/versionHelper` 
+## B: Usage git changelog
+To generate a git changelog, grouped by tag you can run `getTagGroupedGitlog` from git submodule `buildSrc/src/main/kotlin/info/git/versionHelper` 
 This will automatic generate a changelog based on git history, grouped by tags.
 
 ```kts