Use "rebinding keys" in the "Rebinding" section of the manual

* doc/emacs/custom.texi (Rebinding): Use the term "rebinding keys"
instead of "redefining keys", because the former seems more
logical (bug#21036).
1 job for master in 56 minutes and 53 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Test
failed #2841
test-all

00:56:53

 
Name Stage Failure
failed
test-all Test
make[2]: *** [check-doit] Error 1
Makefile:318: recipe for target 'check-doit' failed
make[2]: Leaving directory '/builds/emacs/emacs/test'
Makefile:293: recipe for target 'check-expensive' failed
make[1]: *** [check-expensive] Error 2
make[1]: Leaving directory '/builds/emacs/emacs/test'
Makefile:959: recipe for target 'check-expensive' failed
make: *** [check-expensive] Error 2
ERROR: Job failed: exit code 1