mime: Comment for (*WordDecoder).Decode is wrong

[nussjustin]

The comment for Decode states that "If word is not a valid RFC 2047 encoded-word, word is returned unchanged.", but the implementation always returns an empty string for not RFC 2047 encoded words.

The comment should be updated to represent the actual implementation.

[bradfitz]

Or even Go 1.5.2, since it's just a doc change, @ianlancetaylor?

[ianlancetaylor]

Sure, 1.5.2 is fine with me. I don't know anything about this code but the issue does suggest that the comment is completely wrong.

[rsc]

Not important enough for Go 1.5.2. There's too much already.

[bradfitz]

This is a doc fix.