Update src/doc/src/reference/semver.md

Co-authored-by: Ed Page <eopage@gmail.com>

Author: kpreid

src/doc/src/reference/semver.md

@@ -2018,7 +2018,7 @@ previous releases). Just keep in mind that some large projects may not be able
 to update their Rust toolchain rapidly.
 
 Mitigation strategies:
-* Specify your package’s minimum-supported Rust version by setting
+* Document your package’s minimum-supported Rust version by setting
   [`package.rust-version`], allowing Cargo’s dependency resolution to
   attempt to [select older versions of your package] when needed.
   Be sure to consider the [support expectations] when doing so.