line-log: fix documentation formatting

The second paragraph of the added description for the -L option
"<start> and <end> can take one of these forms:", and the list of
forms that follow the headline, were indented one level too short,
due to the missing "+" to signal that the next paragraph continues
the previous one.

Also "You can specify this option more than once" is about the -L
option, not about its various forms of starting and ending points.
Move it to the end of the main text.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/git-log.txt

@@ -76,12 +76,11 @@ produced by --stat etc.
 	not give any pathspec limiters.  This is currently limited to
 	a walk starting from a single revision, i.e., you may only
 	give zero or one positive revision arguments.
-
+	You can specify this option more than once.
++
 <start> and <end> can take one of these forms:
 
 include::line-range-format.txt[]
-You can specify this option more than once.
-
 
 --full-line-diff::
 	Always print the interesting range even if the current commit