doc: add information regarding external commands

Git supports running external commands in the user's PATH as if they
were built-in commands (see execv_dashed_external in git.c).

This feature was not fully documented in Git's user-facing
documentation.
This commit adds a short documentation of this feature, making it easier
for users to discover and use.

Signed-off-by: Omri Sarig <omri.sarig13@gmail.com>

Author: omrisarig13

Documentation/git.adoc

@@ -487,6 +487,13 @@ System
 	`$HOMEDRIVE$HOMEPATH` if both `$HOMEDRIVE` and `$HOMEPATH` exist;
 	otherwise `$USERPROFILE` if `$USERPROFILE` exists.
 
+`PATH`::
+	When a user runs 'git <command>' that is not part of the core Git programs
+	(installed in GIT_EXEC_PATH), 'git-<command>' that is runnable by the user
+	in a directory on `$PATH` is invoked. Argument passed after the command
+	name are passed as-is to the runnable program. These commands precedes
+	alias expansion.
+
 The Git Repository
 ~~~~~~~~~~~~~~~~~~
 These environment variables apply to 'all' core Git commands. Nb: it