Grammar errors in branch formation description

[LeDuble]

Fixing grammar error in branch formation description and in other areas where the same description is found.

The following phrases will be fixed:
Old versions:

• A code change which isn't bug fix or adds a feature. It's restructure of the code without changing the functionality.

New versions:

• A code change which isn't a bug fix or adds a feature. It's a restructure of the code without changing the functionality.