fix typo in test documentation #2 (flutter#174707)

simular to flutter#174292

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Author: AbdeMohlbi

packages/flutter_tools/gradle/src/test/kotlin/AppLinkSettingsTest.kt

@@ -39,7 +39,7 @@ class AppLinkSettingsTest {
         val settingsJson = appLinkSettings.toJson()
 
         // Keys are not a reference because the key values are accessed
-        // across the gradle/dart boundery.
+        // across the gradle/dart boundary.
         assertTrue(settingsJson.containsKey("applicationId"))
         assertTrue(settingsJson.containsKey("deeplinkingFlagEnabled"))
         assertTrue(settingsJson.containsKey("deeplinks"))

packages/flutter_tools/gradle/src/test/kotlin/IntentFilterCheckTest.kt

@@ -18,7 +18,7 @@ class IntentFilterCheckTest {
         val intentJson = intentFilterCheck.toJson()
 
         // Keys are not a reference because the key values are accessed
-        // across the gradle/dart boundery.
+        // across the gradle/dart boundary.
         assertTrue(intentJson.containsKey("hasAutoVerify"))
         assertTrue(intentJson.containsKey("hasActionView"))
         assertTrue(intentJson.containsKey("hasDefaultCategory"))