Fix typo (review feedback)

Thanks @notEthan!

Author: handrews

versions/3.0.4.md

@@ -4131,7 +4131,7 @@ Reserved characters with no special meaning defined within a component can be le
 However, other specifications can define special meanings, requiring percent-encoding for those characters outside of the additional special meanings.
 
 The `form-urlencoded` media type defines special meanings for `=` and `&` as delimiters, and `+` as the replacement for the space character (instead of its percent-encoded form of `%20`).
-This means that while these three characters are reserved-but-allowed in query strings by RFC3986, the must be percent-encoded in `form-urlencoded` query strings except when used for their `form-urlencoded` purposes; see [Appendix C](#usingRFC6570Implementations) for an example of handling `+` in form values.
+This means that while these three characters are reserved-but-allowed in query strings by RFC3986, they must be percent-encoded in `form-urlencoded` query strings except when used for their `form-urlencoded` purposes; see [Appendix C](#usingRFC6570Implementations) for an example of handling `+` in form values.
 
 ### Percent-Encoding and `form-data`