[TASK] End the sentences that introduce a code block with a colon

Documentation/Howto/Migration/Index.rst

@@ -218,7 +218,7 @@ This allows you to render your documentation by using
 
 instead of typing a long :bash:`docker run...` or :bash:`podman run...` command.
 
-When rendering locally you should ideally see something like this
+When rendering locally you should ideally see something like this:
 
 ..  code-block:: text
 

Documentation/Maintainers/BackportChanges.rst

@@ -168,9 +168,10 @@ Please make sure that you are in the branch you have just pushed into.
 Preferably `main`:
 
 ..  code-block:: shell
+
     git checkout main
 
-Look up the commit ID with
+Look up the commit ID with:
 
 ..  code-block:: shell
 
@@ -206,7 +207,7 @@ For a visual confirmation you can now execute the building process again with:
 
     make docs
 
-If everything looks fine continue the cherry-pick with
+If everything looks fine continue the cherry-pick with:
 
 ..  code-block:: shell