site: fix TOC in contributing, manuals

[ci skip]

CONTRIBUTING.md

@@ -1,5 +1,5 @@
 <!-- consolidating dev docs from wiki, https://github.com/simonmichael/hledger/issues/920 WIP -->
-$toc$
+$TOC$
 
 <style>
 /* table styles */

doc/common.m4

@@ -30,7 +30,7 @@ This doc is for version **_version_** (dev).
 m4_dnl
 m4_dnl Insert a table of contents marker, which doc build scripts will populate.
 m4_define({{_toc_}},{{
-\$toc\$
+\$TOC\$
 }})m4_dnl
 m4_dnl
 m4_dnl Helpers for generating table markup.

doc/manpage.html

@@ -10,7 +10,7 @@ $include-before$
 $endfor$
 -->
 
-<!-- $toc$ -->
+<!-- $TOC$ -->
 
 $body$
 

tools/pandoc-drop-toc.lua

@@ -1,6 +1,6 @@
 function Para(p)
     if not  p.content[1]                  then return p end
     if not (p.content[1].t    == "Str")   then return p end
-    if not (p.content[1].text == "$toc$") then return p end
+    if not (p.content[1].text == "$TOC$") then return p end
     return pandoc.Null()
 end