user-manual: more explanation of push and pull usage

Recently a user on the mailing list complained that they'd read the
manual but couldn't figure out how to keep a couple private repositories
in sync.  They'd tried using push, and were surprised by the effect.

Add a little text in an attempt to make it clear that:
	- Pushing to a branch that is checked out will have odd results.
	- It's OK to synchronize just using pull if that's simpler.

Signed-off-by: "J. Bruce Fields" <bfields@citi.umich.edu>
diff --git a/Documentation/user-manual.txt b/Documentation/user-manual.txt
index e9da591..2aed7eb 100644
--- a/Documentation/user-manual.txt
+++ b/Documentation/user-manual.txt
@@ -1772,7 +1772,7 @@
 
 If you and the maintainer both have accounts on the same machine, then
 you can just pull changes from each other's repositories directly;
-commands that accepts repository URLs as arguments will also accept a
+commands that accept repository URLs as arguments will also accept a
 local directory name:
 
 -------------------------------------------------
@@ -1780,6 +1780,15 @@
 $ git pull /path/to/other/repository
 -------------------------------------------------
 
+or an ssh url:
+
+-------------------------------------------------
+$ git clone ssh://yourhost/~you/repository
+-------------------------------------------------
+
+For projects with few developers, or for synchronizing a few private
+repositories, this may be all you need.
+
 However, the more common way to do this is to maintain a separate public
 repository (usually on a different host) for others to pull changes
 from.  This is usually more convenient, and allows you to cleanly
@@ -1802,6 +1811,8 @@
         |               they push             V
   their public repo <------------------- their repo
 
+We explain how to do this in the following sections.
+
 [[setting-up-a-public-repository]]
 Setting up a public repository
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -1913,6 +1924,12 @@
 $ git push ssh://yourserver.com/~you/proj.git +master
 -------------------------------------------------
 
+Note that the target of a "push" is normally a
+<<def_bare_repository,bare>> repository.  You can also push to a
+repository that has a checked-out working tree, but the working tree
+will not be updated by the push.  This may lead to unexpected results if
+the branch you push to is the currently checked-out branch!
+
 As with git-fetch, you may also set up configuration options to
 save typing; so, for example, after