doc/protocol.rst: fix mistake in footnotes
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		@@ -1578,6 +1578,6 @@ client-to-client messages are local to the current partition.
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.. [#since_0_14] Since :program:`MPD` 0.14
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					.. [#since_0_14] Since :program:`MPD` 0.14
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.. [#since_0_15] Since :program:`MPD` 0.15
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					.. [#since_0_15] Since :program:`MPD` 0.15
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.. [#since_0_16] Since :program:`MPD` 0.16
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					.. [#since_0_16] Since :program:`MPD` 0.16
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.. [#since_0_19] Since :program:`MPD` 0.20
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					.. [#since_0_19] Since :program:`MPD` 0.19
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.. [#since_0_20] Since :program:`MPD` 0.20
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					.. [#since_0_20] Since :program:`MPD` 0.20
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.. [#since_0_21] Since :program:`MPD` 0.21
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					.. [#since_0_21] Since :program:`MPD` 0.21
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