spelling: additionally

Signed-off-by: Josh Soref <2119212+jsoref@users.noreply.github.com>

build/mac/find_sdk.py

@@ -77,7 +77,7 @@ def main():
         action="store_true",
         dest="print_sdk_path",
         default=False,
-        help="Additionaly print the path the SDK (appears first).")
+        help="Additionally print the path the SDK (appears first).")
     parser.add_option(
         "--create_symlink_at",
         action="store",

runtime/vm/app_snapshot.cc

@@ -495,7 +495,7 @@ class ClassDeserializationCluster : public DeserializationCluster {
 // explicitly as Array objects into the snapshot and instead utilize a different
 // encoding: objects in a cluster representing a canonical set are sorted
 // to appear in the same order they appear in the Array representing the set,
-// and we additionaly write out array of values describing gaps between objects.
+// and we additionally write out array of values describing gaps between objects.
 //
 // In some situations not all canonical objects of the some type need to
 // be added to the resulting canonical set because they are cached in some