Fix URLs to ros2.repos files (ros2#1119) (ros2#1121)

'release-foxy' does not point to a valid file and 'release-latest' is no longer used.

Signed-off-by: Jacob Perron <[email protected]>
(cherry picked from commit b0f7676)

# Conflicts:
#	source/Installation/Maintaining-a-Source-Checkout.rst

Co-authored-by: Jacob Perron <[email protected]>

Author: mergify[bot]

source/Installation/Maintaining-a-Source-Checkout.rst

@@ -55,7 +55,7 @@ If you wish to checkout the latest development code for the upcoming ROS release
 Update your repositories
 ------------------------
 
-You will notice that in the `ros2.repos <https://raw.githubusercontent.com/ros2/ros2/release-latest/ros2.repos>`__ file, each repository has a ``version`` associated with it that points to a particular commit hash, tag, or branch name.
+You will notice that in the `ros2.repos <https://raw.githubusercontent.com/ros2/ros2/master/ros2.repos>`__ file, each repository has a ``version`` associated with it that points to a particular commit hash, tag, or branch name.
 It is possible that these versions refer to new tags/branches that your local copy of the repositories will not recognize as they are out-of-date.
 Because of this, you should update the repositories that you have already checked out with the following command: