rst: fix detection of single-row tables

This fixes option lists for commands with only an --mq option.

mercurial/commands.py

@@ -2768,6 +2768,7 b' def help_(ui, name=None, unknowncmd=Fals'
             data.append((so, lo, desc))
 
         rst = minirst.maketable(data, 1)
+
         if multioccur:
             rst += _("\n[+] marked option can be specified multiple times")
 

mercurial/minirst.py

@@ -262,7 +262,7 b' def findtables(blocks):'
         #  x    y   z
         # === ==== ===
         if (block['type'] == 'paragraph' and
-            len(block['lines']) > 4 and
+            len(block['lines']) > 2 and
             _tablere.match(block['lines'][0]) and
             block['lines'][0] == block['lines'][-1]):
             block['type'] = 'table'