-If second arg FIXEDCASE is non-nil, do not alter case of replacement text.
-Otherwise maybe capitalize the whole text, or maybe just word initials,
-based on the replaced text.
-If the replaced text has only capital letters
-and has at least one multiletter word, convert NEWTEXT to all caps.
-Otherwise if all words are capitalized in the replaced text,
-capitalize each word in NEWTEXT.
+If optional second arg FIXEDCASE is non-nil, do not alter the case of
+the replacement text. Otherwise, maybe capitalize the whole text, or
+maybe just word initials, based on the replaced text. If the replaced
+text has only capital letters and has at least one multiletter word,
+convert NEWTEXT to all caps. Otherwise if all words are capitalized
+in the replaced text, capitalize each word in NEWTEXT.