setup CI and tidy to use typos for spellchecking and fix few typos

compiler/rustc_session/src/config.rs

@@ -190,7 +190,7 @@ pub struct CoverageOptions {
     /// to keep supporting this flag, remove it.
     pub no_mir_spans: bool,
 
-    /// `-Zcoverage-options=discard-all-spans-in-codegen`: During codgen,
+    /// `-Zcoverage-options=discard-all-spans-in-codegen`: During codegen,
     /// discard all coverage spans as though they were invalid. Needed by
     /// regression tests for #133606, because we don't have an easy way to
     /// reproduce it from actual source code.

compiler/rustc_session/src/session.rs

@@ -1545,7 +1545,7 @@ impl RemapFileNameExt for rustc_span::FileName {
             "one and only one scope should be passed to for_scope"
         );
         if sess.opts.unstable_opts.remap_path_scope.contains(scope) {
-            self.prefer_remapped_unconditionaly()
+            self.prefer_remapped_unconditionally()
         } else {
             self.prefer_local()
         }