rev-list-options: clarify --parents and --children

Make it clearer that --parents resp. --children list the parent resp.
child commits next to each commit, so that I understand next time.

Signed-off-by: Michael J Gruber <git@drmicha.warpmail.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/rev-list-options.txt

@@ -45,13 +45,13 @@ endif::git-rev-list[]
 
 --parents::
 
-	Print the parents of the commit.  Also enables parent
-	rewriting, see 'History Simplification' below.
+	Print also the parents of the commit (in the form "commit parent...").
+	Also enables parent rewriting, see 'History Simplification' below.
 
 --children::
 
-	Print the children of the commit.  Also enables parent
-	rewriting, see 'History Simplification' below.
+	Print also the children of the commit (in the form "commit child...").
+	Also enables parent rewriting, see 'History Simplification' below.
 
 ifdef::git-rev-list[]
 --timestamp::