Update README.md

- Update ui.md
- Update type-alias-impl-trait.md
- Update README.md

Author: kilavvy

stdarch/crates/intrinsic-test/README.md

@@ -7,7 +7,7 @@ USAGE:
     intrinsic-test [FLAGS] [OPTIONS] <INPUT>
 
 FLAGS:
-        --a32              Run tests for A32 instrinsics instead of A64
+        --a32              Run tests for A32 intrinsics instead of A64
         --generate-only    Regenerate test programs, but don't build or run them
     -h, --help             Prints help information
     -V, --version          Prints version information