doc: remove custom callouts format

The code to render callouts for manpages comes from 17 years ago:
776e994 (Properly render asciidoc "callouts" in git man pages.,
2006-04-28), and it was needed back then, but DocBook Stylesheets added
support for that in 2008 [1], since 1.74.0 it hasn't been necessary.

What's worse: the format of the upstream callouts is much nicer than our
hacked version.

Compare this:

     $ git diff            (1)
     $ git diff --cached   (2)
     $ git diff HEAD       (3)

  1. Changes in the working tree not yet staged for the next
     commit.
  2. Changes between the index and your last commit; what you
     would be committing if you run git commit without -a
     option.
  3. Changes in the working tree since your last commit; what
     you would be committing if you run git commit -a

To this:

     $ git diff            (1)
     $ git diff --cached   (2)
     $ git diff HEAD       (3)

 1. Changes in the working tree not yet staged for the next commit.
 2. Changes between the index and your last commit; what you would
 be committing if you run git commit without -a option.
 3. Changes in the working tree since your last commit; what you
 would be committing if you run git commit -a

Let's drop our unnecessary inferior custom format and use the official
one.

[1] https://sourceforge.net/p/docbook/code/7842/

Signed-off-by: Felipe Contreras <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: felipec

Documentation/manpage-normal.xsl

@@ -8,19 +8,4 @@
 <xsl:param name="man.output.quietly" select="1"/>
 <xsl:param name="refentry.meta.get.quietly" select="1"/>
 
-<!-- convert asciidoc callouts to man page format -->
-<xsl:template match="co">
-	<xsl:value-of select="concat('\fB(',substring-after(@id,'-'),')\fR')"/>
-</xsl:template>
-<xsl:template match="calloutlist">
-	<xsl:text>.sp&#10;</xsl:text>
-	<xsl:apply-templates/>
-	<xsl:text>&#10;</xsl:text>
-</xsl:template>
-<xsl:template match="callout">
-	<xsl:value-of select="concat('\fB',substring-after(@arearefs,'-'),'. \fR')"/>
-	<xsl:apply-templates/>
-	<xsl:text>.br&#10;</xsl:text>
-</xsl:template>
-
 </xsl:stylesheet>