gendoc: dedent documentation from docstrings

When getting docstrings from the source they are indented to look good
in the code. This indentation interferes with how the text is parsed
by rst. Therefore this indentation is removed.

doc/gendoc.py

@@ -1,4 +1,4 b''
-import os, sys
+import os, sys, textwrap
 # import from the live mercurial repo
 sys.path.insert(0, "..")
 # fall back to pure modules if required C extensions are not available
@@ -21,7 +21,10 b' def get_desc(docstr):'
     if i != -1:
         desc = docstr[i + 2:]
     else:
-        desc = "    %s" % shortdesc
+        desc = shortdesc
+
+    desc = textwrap.dedent(desc)
+
     return (shortdesc, desc)
 
 def get_opts(opts):
@@ -102,6 +105,7 b' def commandprinter(ui, cmdtable):'
         subsection(ui, d['cmd'])
         # synopsis
         ui.write("``%s``\n" % d['synopsis'].replace("hg ","", 1))
+        ui.write("\n")
         # description
         ui.write("%s\n\n" % d['desc'][1])
         # options