Documentation: suggest `reset --merge` in How Merge Works section

The 'merge' manual suggests 'reset' to cancel a merge at the end
of the Merge Strategies list.  It is more logical to explain this
right before explaining how merge conflicts work, so the daunted
reader can have a way out when he or she needs it most.

While at it, make the advice more dependable and self-contained
by providing the --merge option.

Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Thomas Rast <trast@student.ethz.ch>

Documentation/git-merge.txt

@@ -45,9 +45,6 @@ include::merge-options.txt[]
 include::merge-strategies.txt[]
 
 
-If you tried a merge which resulted in complex conflicts and
-want to start over, you can recover with 'git reset'.
-
 HOW MERGE WORKS
 ---------------
 
@@ -115,6 +112,9 @@ When there are conflicts, the following happens:
    same and the index entries for them stay as they were,
    i.e. matching `HEAD`.
 
+If you tried a merge which resulted in complex conflicts and
+want to start over, you can recover with `git reset --merge`.
+
 HOW CONFLICTS ARE PRESENTED
 ---------------------------