Update my code ownership to better reflect my responsibilities to the…

… repo (grafana#3386)

I don't want to confuse contributors or other maintainers either by:
1. ignoring PRs because they are not my core responsibility
1. approving PRs that the project maintainers would prefer I didn't

I've taken the opportunity to add a comment header to the CODEOWNER file to explain how to use the file.
The same conventions are used in the grafana/grafana and grafana/website repository and probably more.

Signed-off-by: Jack Baldry <[email protected]>

CODEOWNERS

@@ -1,2 +1,25 @@
+# Lines starting with '#' are comments.
+# Each line is a file pattern followed by one or more owners.
+
+# More details are here: https://help.github.com/articles/about-codeowners/
+
+# The '*' pattern is global owners.
+
+# Order is important. The last matching pattern has the most precedence.
+# The folders are ordered as follows:
+
+# In each subsection folders are ordered first by depth, then alphabetically.
+# This should make it easy to add new rules without breaking existing ones.
+
 * @joe-elliott @annanay25 @mdisibio @mapno @kvrhdn @zalegrala @electron0zero @ie-pham @stoewer
-/docs/ @jdbaldry @knylander-grafana @joe-elliott @annanay25 @mdisibio @mapno @kvrhdn @zalegrala @electron0zero @ie-pham @stoewer
+
+/docs/ @knylander-grafana @joe-elliott @annanay25 @mdisibio @mapno @kvrhdn @zalegrala @electron0zero @ie-pham @stoewer
+
+/.github/backport.yml           @jdbaldry @joe-elliott @annanay25 @mdisibio @mapno @kvrhdn @zalegrala @electron0zero @ie-pham @stoewer
+/.github/update-make-docs.yml   @jdbaldry @joe-elliott @annanay25 @mdisibio @mapno @kvrhdn @zalegrala @electron0zero @ie-pham @stoewer
+/.github/website-next.yml       @jdbaldry @joe-elliott @annanay25 @mdisibio @mapno @kvrhdn @zalegrala @electron0zero @ie-pham @stoewer
+/.github/website-versioned.yml  @jdbaldry @joe-elliott @annanay25 @mdisibio @mapno @kvrhdn @zalegrala @electron0zero @ie-pham @stoewer
+/docs/docs.mk                   @jdbaldry @knylander-grafana @joe-elliott @annanay25 @mdisibio @mapno @kvrhdn @zalegrala @electron0zero @ie-pham @stoewer
+/docs/make-docs                 @jdbaldry @knylander-grafana @joe-elliott @annanay25 @mdisibio @mapno @kvrhdn @zalegrala @electron0zero @ie-pham @stoewer
+/docs/Makefile                  @jdbaldry @knylander-grafana @joe-elliott @annanay25 @mdisibio @mapno @kvrhdn @zalegrala @electron0zero @ie-pham @stoewer
+/docs/variables.mk              @jdbaldry @knylander-grafana @joe-elliott @annanay25 @mdisibio @mapno @kvrhdn @zalegrala @electron0zero @ie-pham @stoewer