convert: fixed typo in docstring

hgext/convert/__init__.py

@@ -107,7 +107,7 b' def convert(ui, src, dest=None, revmapfi'
     instance) move code in one repository from "default" to a named branch.
 
     Mercurial Source
-    -----------------
+    ----------------
 
     --config convert.hg.ignoreerrors=False    (boolean)
         ignore integrity errors when reading. Use it to fix Mercurial

tests/test-convert.out

@@ -91,7 +91,7 b' convert a foreign SCM repository to a Me'
     instance) move code in one repository from "default" to a named branch.
 
     Mercurial Source
-    -----------------
+    ----------------
 
     --config convert.hg.ignoreerrors=False    (boolean)
         ignore integrity errors when reading. Use it to fix Mercurial