bug#5986: Typo in cperl-mode.el

[Reuben Thomas]

"*Non-nil means that CPerl uses `font-lock's routines for syntaxification."

is missing a close quote:

"*Non-nil means that CPerl uses `font-lock''s routines for syntaxification."

(Unless I have overlooked a convention for eliding a close quote when
it is followed by an apostrophe. But lower down in the same file I
find:

Newer `font-lock's can do it themselves.

which suggests that the extra quote is needed in the first case above
to distinguish it from the second.)

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