Update README.md

Author: teryror

README.md

@@ -284,7 +284,7 @@ different Miri binaries, and as such worth documenting:
   build (for which some crates need special treatment).
 * `MIRI_CALLED_FROM_RUSTDOC` when set to any value tells `cargo-miri` that it is
   running as a child process of `rustdoc`, which invokes it twice for each doc-test
-  and requires special treatment, most notably a check-only build before validation.
+  and requires special treatment, most notably a check-only build before interpretation.
   This is set by `cargo-miri` itself when running as a `rustdoc`-wrapper.
 * `MIRI_CWD` when set to any value tells the Miri driver to change to the given
   directory after loading all the source files, but before commencing