chore: fix typo in codebase (#11846)

packages/babel-core/src/config/files/import.js

@@ -1,5 +1,5 @@
 // @flow
-// We keep this in a seprate file so that in older node versions, where
+// We keep this in a separate file so that in older node versions, where
 // import() isn't supported, we can try/catch around the require() call
 // when loading this file.
 

packages/babel-core/src/gensync-utils/async.js

@@ -10,7 +10,7 @@ const runGenerator = gensync(function* (item) {
   return yield* item;
 });
 
-// This Gensync returns true if the current execution contect is
+// This Gensync returns true if the current execution context is
 // asynchronous, otherwise it returns false.
 export const isAsync = gensync<[], boolean>({
   sync: () => false,