Name the escape hatch that actually works (#308)

The peel costs a couple of microseconds per non-ASCII parse and is not
gated on segment_scripts -- deliberate, and the prose already says so,
but a performance-sensitive caller reaches for that field first.
Emptying honorific_tails hits the peel's first-line guard and recovers
the cost; customize.rst already documents that removal as the
BEHAVIORAL off-switch, so one clause there covers the other reason to
reach for it.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

Author: derek73

docs/customize.rst

@@ -369,7 +369,11 @@ vocabulary is also the peel's off-switch —
 ``Lexicon.default().remove(honorific_tails={"さん"})`` leaves
 ``田中さん`` unsplit while the spaced ``田中 さん`` still reads ``さん``
 as a suffix. Dropping a word from a marker field alone orphans
-nothing, so that one needs no matching ``suffix_words`` edit.
+nothing, so that one needs no matching ``suffix_words`` edit. Emptying
+the field is also the way to opt out of what the peel *costs* a
+non-ASCII parse — an empty ``honorific_tails`` stops it at its first
+guard, whereas ``segment_scripts`` never gated it and so cannot turn it
+off.
 
 .. note::