Add examples for git-log documentation and others.

I don't think people really follow the links or think very abstractly at
all in the first place.

So I was thinking more of some explicit examples. I actually think every
command should have an example in the man-page, and hey, here's a patch to
start things off.

Of course, I'm not exactly "Mr Documentation", and I don't know that this
is the prettiest way to do this, but I checked that the resulting html and
man-page seems at least reasonable.

And hey, if the examples look like each other, that's just because I'm
also not "Mr Imagination".

Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>

Documentation/git-log.txt

@@ -30,6 +30,24 @@ OPTIONS
 	Show only commits between the named two commits.
 
 
+Examples
+--------
+git log --no-merges::
+
+	Show the whole commit history, but skip any merges
+
+git log v2.6.12.. include/scsi drivers/scsi::
+
+	Show all commits since version 'v2.6.12' that changed any file
+	in the include/scsi or drivers/scsi subdirectories
+
+git log --since="2 weeks ago" -- gitk::
+
+	Show the changes during the last two weeks to the file 'gitk'.
+	The "--" is necessary to avoid confusion with the *branch* named
+	'gitk'
+
+
 Author
 ------
 Written by Linus Torvalds <torvalds@osdl.org>

Documentation/git-whatchanged.txt

@@ -51,6 +51,20 @@ OPTIONS
 	However, it is not very useful in general, although it
 	*is* useful on a file-by-file basis.
 
+Examples
+--------
+git-whatchanged -p v2.6.12.. include/scsi drivers/scsi::
+
+	Show as patches the commits since version 'v2.6.12' that changed
+	any file in the include/scsi or drivers/scsi subdirectories
+
+git-whatchanged --since="2 weeks ago" -- gitk::
+
+	Show the changes during the last two weeks to the file 'gitk'.
+	The "--" is necessary to avoid confusion with the *branch* named
+	'gitk'
+
+
 Author
 ------
 Written by Linus Torvalds <torvalds@osdl.org> and

Documentation/gitk.txt

@@ -24,6 +24,19 @@ OPTIONS
 	Some argument not yet documented.
 
 
+Examples
+--------
+gitk v2.6.12.. include/scsi drivers/scsi::
+
+	Show as the changes since version 'v2.6.12' that changed any
+	file in the include/scsi or drivers/scsi subdirectories
+
+gitk --since="2 weeks ago" -- gitk::
+
+	Show the changes during the last two weeks to the file 'gitk'.
+	The "--" is necessary to avoid confusion with the *branch* named
+	'gitk'
+
 Author
 ------
 Written by Paul Mackerras <paulus@samba.org>