[v3] Update Markdown files to latest spec (#252)

ErikSchierboom · web-flow · commit 4be49b310780 · 2021-05-04T13:52:43.000+01:00
All Markdown files should, from this point on, start with a level one heading. See exercism/configlet#150 for the rationale behind these changes. The full specification can be found [here](https://github.com/exercism/docs/blob/main/contributing/standards/markdown.md).
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
@@ -1,3 +1,5 @@
+# Contributing
+
 To help improve this track you can:
 1. check opened issues and help in fixing them: https://github.com/exercism/groovy/issues
 1. add a new exercise to the track (see the information below)
diff --git a/docs/ABOUT.md b/docs/ABOUT.md
@@ -1,3 +1,5 @@
+# About
+
 [Groovy](http://www.groovy-lang.org/) is the Apache Foundation's powerful, optionally typed, dynamic language, which also features static-typing and static compilation capabilities.
 
 Groovy is aimed at improving developer productivity thanks to a concise, easy to learn syntax.
diff --git a/docs/LEARNING.md b/docs/LEARNING.md
@@ -1,3 +1,5 @@
+# Learning
+
 Interested in getting started with Groovy, or learning more while you work on exercises?
 
 Try out Groovy with
diff --git a/docs/TESTS.md b/docs/TESTS.md
@@ -1,3 +1,5 @@
+# Tests
+
 ## Running Tests
 
 Execute the test specification with:

Original file line number	Diff line number	Diff line change
`@@ -1,3 +1,5 @@`
	`1`	`+# Contributing`
	`2`	`+`
`1`	`3`	`To help improve this track you can:`
`2`	`4`	`1. check opened issues and help in fixing them: https://github.com/exercism/groovy/issues`
`3`	`5`	`1. add a new exercise to the track (see the information below)`
Original file line number	Diff line number	Diff line change
`@@ -1,3 +1,5 @@`
	`1`	`+# About`
	`2`	`+`
`1`	`3`	`[Groovy](http://www.groovy-lang.org/) is the Apache Foundation's powerful, optionally typed, dynamic language, which also features static-typing and static compilation capabilities.`
`2`	`4`
`3`	`5`	`Groovy is aimed at improving developer productivity thanks to a concise, easy to learn syntax.`
Original file line number	Diff line number	Diff line change
`@@ -1,3 +1,5 @@`
	`1`	`+# Learning`
	`2`	`+`
`1`	`3`	`Interested in getting started with Groovy, or learning more while you work on exercises?`
`2`	`4`
`3`	`5`	`Try out Groovy with`
Original file line number	Diff line number	Diff line change
`@@ -1,3 +1,5 @@`
	`1`	`+# Tests`
	`2`	`+`
`1`	`3`	`## Running Tests`
`2`	`4`
`3`	`5`	`Execute the test specification with:`