Clarify docstring

kemetone/normalize_tashkeel.py

@@ -9,8 +9,8 @@ in real text. espeak-ng only honours the canonical one:
     consonant + harakat + shadda   ->  الشَّمْس  ʔaʃʃms     (vowel SILENTLY dropped)
 
 The wrong order does not error, it just deletes a vowel from the phoneme
-string. Applied across a corpus that is a systematic pronunciation defect that
-no symbol-map assertion would catch, so normalize before phonemizing.
+string — a silent pronunciation defect that no symbol-map assertion would
+catch. So normalize before phonemizing.
 """
 
 import re