fetch doc: move FETCH_HEAD material lower and add an example

Signed-off-by: Marc Branchaud <marcnarc@xiplink.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: marcnarc

Documentation/git-fetch.txt

@@ -18,13 +18,9 @@ SYNOPSIS
 DESCRIPTION
 -----------
 Fetch branches and/or tags (collectively, "refs") from one or more
-other repositories, along with the objects necessary to complete
-their histories.
-
-The names of refs that are fetched, together with the object names
-they point at, are written to `.git/FETCH_HEAD`.  This information
-can be used to learn what was fetched.  In addition, the remote-tracking
-branches are updated (see description on <refspec> below for details).
+other repositories, along with the objects necessary to complete their
+histories.  Remote-tracking branches are updated (see the description
+of <refspec> below for ways to control this behavior).
 
 By default, any tag that points into the histories being fetched is
 also fetched; the effect is to fetch tags that
@@ -34,14 +30,18 @@ configuring remote.<name>.tagopt.  By using a refspec that fetches tags
 explicitly, you can fetch tags that do not point into branches you
 are interested in as well.
 
-'git fetch' can fetch from either a single named repository,
+'git fetch' can fetch from either a single named repository or URL,
 or from several repositories at once if <group> is given and
 there is a remotes.<group> entry in the configuration file.
 (See linkgit:git-config[1]).
 
 When no remote is specified, by default the `origin` remote will be used,
 unless there's an upstream branch configured for the current branch.
 
+The names of refs that are fetched, together with the object names
+they point at, are written to `.git/FETCH_HEAD`.  This information
+may be used by scripts or other git commands, such as linkgit:git-pull[1].
+
 OPTIONS
 -------
 include::fetch-options.txt[]
@@ -78,6 +78,19 @@ the local repository by fetching from the branches (respectively)
 The `pu` branch will be updated even if it is does not fast-forward,
 because it is prefixed with a plus sign; `tmp` will not be.
 
+* Peek at a remote's branch, without configuring the remote in your local
+repository:
++
+------------------------------------------------
+$ git fetch git://git.kernel.org/pub/scm/git/git.git maint
+$ git log FETCH_HEAD
+------------------------------------------------
++
+The first command fetches the `maint` branch from the repository at
+`git://git.kernel.org/pub/scm/git/git.git` and the second command uses
+`FETCH_HEAD` to examine the branch with linkgit:git-log[1].  The fetched
+objects will eventually be removed by git's built-in housekeeping (see
+linkgit:git-gc[1]).
 
 BUGS
 ----