Merge branch 'tr/maint-merge-ours-clarification' (early part)

* 'tr/maint-merge-ours-clarification' (early part):
  rebase docs: clarify --merge and --strategy
  Documentation: clarify 'ours' merge strategy

Documentation/git-rebase.txt

@@ -228,13 +228,23 @@ OPTIONS
 	Use merging strategies to rebase.  When the recursive (default) merge
 	strategy is used, this allows rebase to be aware of renames on the
 	upstream side.
++
+Note that a rebase merge works by replaying each commit from the working
+branch on top of the <upstream> branch.  Because of this, when a merge
+conflict happens, the side reported as 'ours' is the so-far rebased
+series, starting with <upstream>, and 'theirs' is the working branch.  In
+other words, the sides are swapped.
 
 -s <strategy>::
 --strategy=<strategy>::
 	Use the given merge strategy.
-	If there is no `-s` option, a built-in list of strategies
+	If there is no `-s` option 'git-merge-recursive' is used
-	is used instead ('git-merge-recursive' when merging a single
+	instead.  This implies --merge.
-	head, 'git-merge-octopus' otherwise).  This implies --merge.
++
+Because 'git-rebase' replays each commit from the working branch
+on top of the <upstream> branch using the given strategy, using
+the 'ours' strategy simply discards all patches from the <branch>,
+which makes little sense.
 
 -q::
 --quiet::

Documentation/merge-strategies.txt

@@ -29,8 +29,9 @@ octopus::
 	pulling or merging more than one branch.
 
 ours::
-	This resolves any number of heads, but the result of the
+	This resolves any number of heads, but the resulting tree of the
-	merge is always the current branch head.  It is meant to
+	merge is always that of the current branch head, effectively
+	ignoring all changes from all other branches.  It is meant to
 	be used to supersede old development history of side
 	branches.