doc/protocol.rst: remove documentation about `==` matching substrings

I added this sentence in commit 5271e81e, but this was merely documented the legacy status quo, which has always been undocumented for old-style filters. But for new filters, using "==" for sub strings was a surprising "feature", which I removed in commit ac0852b4.

doc/protocol.rst: remove documentation about `==` matching substrings
0b0f4c61 · Max Kellermann · 228bf7eb · 0b0f4c61
Commit 0b0f4c61 authored Nov 12, 2018 by Max Kellermann
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protocol.rst doc/protocol.rst +4 -4

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--- a/doc/protocol.rst
+++ b/doc/protocol.rst
@@ -152,10 +152,7 @@ of:
  ``VALUE`` in ``AlbumArtist``
  and falls back to ``Artist`` tags if
  ``AlbumArtist`` does not exist.
-  ``VALUE`` is what to find.  The
-  `find` commands specify an exact value
-  and are case-sensitive; the `search`
-  commands specify a sub string and ignore case.
+  ``VALUE`` is what to find.

 - ``(TAG =~ 'VALUE')`` and ``(TAG !~ 'VALUE')`` use a Perl-compatible
  regular expression instead of doing a simple string comparison.
@@ -189,6 +186,9 @@ of:
  be enclosed in parantheses, e.g. :code:`((artist == 'FOO') AND
  (album == 'BAR'))`

+The :command:`find` commands are case sensitive, which
+:command:`search` and related commands ignore case.
+
 Prior to MPD 0.21, the syntax looked like this::

 find TYPE VALUE