rename test methods to be more descriptive

Author: dconeybe

Firestore/Example/Tests/Integration/API/FIRAggregateTests.mm

@@ -1093,7 +1093,7 @@ - (void)testPerformsAverageOnlyOnNumericFields {
                  [[NSNumber numberWithDouble:5] doubleValue]);
 }
 
-- (void)testFailWithGoodMessageIfMissingIndex {
+- (void)testFailWithMessageWithConsoleLinkIfMissingIndex {
   XCTSkipIf([FSTIntegrationTestCase isRunningAgainstEmulator],
             "Skip this test when running against the Firestore emulator because the Firestore "
             "emulator does not use indexes and never fails with a 'missing index' error.");

Firestore/Example/Tests/Integration/API/FIRCountTests.mm

@@ -227,7 +227,7 @@ - (void)testFailWithoutNetwork {
   XCTAssertEqual(snapshot.count, [NSNumber numberWithLong:3L]);
 }
 
-- (void)testFailWithGoodMessageIfMissingIndex {
+- (void)testFailWithMessageWithConsoleLinkIfMissingIndex {
   XCTSkipIf([FSTIntegrationTestCase isRunningAgainstEmulator],
             "Skip this test when running against the Firestore emulator because the Firestore "
             "emulator does not use indexes and never fails with a 'missing index' error.");