GitLab

* processes.texi (Transaction Queues):
* markers.texi (The Mark):
* windows.texi (Choosing Window, Selecting Windows):
* files.texi (Changing Files, Magic File Names):
* commands.texi (Key Sequence Input):
* functions.texi (Declaring Functions):
* strings.texi (Predicates for Strings):
* intro.texi (nil and t): Fix typos (pointed out by Drew Adams).