Correct spelling in doc comments (flutter#7179)

Applies spelling corrections to accessibility-related doc comments and in the
license tool.

lib/ui/semantics.dart

@@ -404,7 +404,7 @@ class SemanticsFlag {
   /// that the node's semantic label can be used to announce an edge triggered
   /// semantics update.
   ///
-  /// Semantic nodes annotated with this flag will still recieve a11y focus.
+  /// Semantic nodes annotated with this flag will still receive a11y focus.
   ///
   /// Updating this label within the same active route subtree will not cause
   /// additional announcements.

shell/platform/android/io/flutter/view/AccessibilityBridge.java

@@ -1153,7 +1153,7 @@ void updateWith(ByteBuffer buffer, String[] strings) {
                     } else if (action.overrideId == Action.LONG_PRESS.value) {
                         onLongPressOverride = action;
                     } else {
-                        // If we recieve a different overrideId it means that we were passed
+                        // If we receive a different overrideId it means that we were passed
                         // a standard action to override that we don't yet support.
                         assert action.overrideId == -1;
                         customAccessibilityActions.add(action);

tools/licenses/lib/patterns.dart

@@ -1209,7 +1209,7 @@ final List<RegExp> csLicenses = <RegExp>[
     r'^\1\2OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF *\n'
     r'^\1\2SUCH DAMAGE\. *\n'
     r'^(?:(?:\1\2?g? *)? *\n)*'
-    r'^\1\2The licence and distribution terms for any publically available version or *\n'
+    r'^\1\2The licence and distribution terms for any publicly available version or *\n'
     r'^\1\2derivative of this code cannot be changed\. +i\.e\. +this code cannot simply be *\n'
     r'^\1\2copied and put under another distribution licence *\n'
     r'^\1\2\[including the GNU Public Licence\.\]',