absorb: remove sf alias for command

I'm not even sure what it is supposed to stand for.

Differential Revision: https://phab.mercurial-scm.org/D4126

hgext/absorb.py

@@ -940,7 +940,7 b' def absorb(ui, repo, stack=None, targetc'
             ui.write(_('nothing applied\n'))
     return state
 
-@command('^absorb|sf',
+@command('^absorb',
          [('p', 'print-changes', None,
            _('print which changesets are modified by which changes')),
           ('i', 'interactive', None,

tests/test-absorb.t

@@ -300,7 +300,7 b' Test obsolete markers creation:'
   > addnoise=1
   > EOF
 
-  $ hg --config absorb.maxstacksize=3 sf
+  $ hg --config absorb.maxstacksize=3 absorb
   absorb: only the recent 3 changesets will be analysed
   2 of 2 chunk(s) applied
   $ hg log -T '{rev}:{node|short} {desc} {get(extras, "absorb_source")}\n'