line-range-format.txt: clarify -L:regex usage form

blame/log documentation describes -L option as:

  -L<start>,<end>
  -L:<regex>

  <start> and <end> can take one of these forms:

    * number
    * /regex/
    * +offset or -offset
    * :regex

which is incorrect and confusing since :regex is not one of the valid
forms of <start> or <end>; in fact, it must be -L's lone argument.

Clarify by discussing :<regex> at the same indentation level as "<start>
and <end>...":

  -L<start>,<end>
  -L:<regex>

  <start> and <end> can take one of these forms:

    * number
    * /regex/
    * +offset or -offset

  If :<regex> is given in place of <start> and <end> ...

Signed-off-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/blame-options.txt

@@ -15,8 +15,6 @@
 	``-L <start>'' or ``-L <start>,'' spans from <start> to end of file.
 	``-L ,<end>'' spans from start of file to <end>.
 +
-<start> and <end> can take one of these forms:
-
 include::line-range-format.txt[]
 
 -l::

Documentation/git-log.txt

@@ -72,8 +72,6 @@ produced by --stat etc.
 	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[]
 
 <revision range>::

Documentation/line-range-format.txt

@@ -1,3 +1,5 @@
+<start> and <end> can take one of these forms:
+
 - number
 +
 If <start> or <end> is a number, it specifies an
@@ -15,11 +17,8 @@ starting at the line given by <start>.
 +
 This is only valid for <end> and will specify a number
 of lines before or after the line given by <start>.
-+
 
-- :regex
 +
-If the option's argument is of the form :regex, it denotes the range
+If ``:<regex>'' is given in place of <start> and <end>, it denotes the range
 from the first funcname line that matches <regex>, up to the next
 funcname line.
-+