Tweak release template to pass markdownlint.

* Remove duplicated blank lines
* Ensure all code blocks have a language specified
* Ensure no headers have duplicated values

Author: Robert Jackson

release-template.md

@@ -1,10 +1,9 @@
-# Release
+# Release Process
 
 Releases are mostly automated using
 [release-it](https://github.com/release-it/release-it/) and
 [lerna-changelog](https://github.com/lerna/lerna-changelog/).
 
-
 ## Preparation
 
 Since the majority of the actual release process is automated, the primary
@@ -25,14 +24,13 @@ When reviewing merged PR's the labels to be used are:
 * internal - Used for internal changes that still require a mention in the
   changelog/release notes.
 
-
 ## Release
 
 Once the prep work is completed, the actual release is straight forward:
 
 * First, ensure that you have installed your projects dependencies:
 
-```
+```sh
 {{INSTALL_DEPENDENCIES}}
 ```
 
@@ -51,7 +49,7 @@ Once the prep work is completed, the actual release is straight forward:
 
 * And last (but not least 😁) do your release.
 
-```
+```sh
 npx release-it
 ```