doc: reset added: version to REPLACEME

Documentation for `CompressionStream` and `DecompressionStream` was
erroneously added in nodejs@f57a0e4d8b
and released in version 16.7.0.

Reset the added: version to REPLACEME.

Refs: nodejs#39348
Refs: nodejs#39899

doc/api/webstreams.md

@@ -1221,51 +1221,51 @@ added: v16.6.0
 
 ### Class: `CompressionStream`
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 #### `new CompressionStream(format)`
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 * `format` {string} One of either `'deflate'` or `'gzip'`.
 
 #### `compressionStream.readable`
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 * Type: {ReadableStream}
 
 #### `compressionStream.writable`
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 * Type: {WritableStream}
 
 ### Class: `DecompressionStream`
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 #### `new DecompressionStream(format)`
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 * `format` {string} One of either `'deflate'` or `'gzip'`.
 
 #### `decompressionStream.readable`
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 * Type: {ReadableStream}
 
 #### `deccompressionStream.writable`
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 * Type: {WritableStream}