small corrections

Signed-off-by: Antonio Mendoza Pérez <antmendoza@gmail.com>

Author: antmendoza

maintainer_guidelines.md

@@ -16,7 +16,7 @@ Here are a few tips for repository maintainers.
 
 ## Branch Management
 
-The `main` branch is is the bleeding edge. New major versions of the module
+The `main` branch is the bleeding edge. New major versions of the module
 are cut from this branch and tagged. If you intend to submit a pull request
 you should use `main HEAD` as your starting point.
 
@@ -26,4 +26,4 @@ release commit, and a new branch `release-1.y.z` for subsequent minor and patch
 level releases of that major version if necessary. However, development will continue
 apace on `main` for the next major version - e.g. 2.0.0. Version branches
 are only created for each major version. Minor and patch level releases
-are simply tagged.
+are simply tagged.