Review Firestore Swift Tests (#13389)

Author: MojtabaHs

Firestore/Swift/Tests/API/BasicCompileTests.swift

@@ -279,7 +279,7 @@ func readDocument(at docRef: DocumentReference) {
         }
       }
 
-      // Option 2: switch on the code and compare agianst raw values.
+      // Option 2: switch on the code and compare against raw values.
       switch nsError.code {
       case FirestoreErrorCode.unavailable.rawValue:
         print("Can't read document due to being offline!")

Firestore/Swift/Tests/Integration/IndexingTests.swift

@@ -19,7 +19,7 @@ import Foundation
 
 class IndexingTests: FSTIntegrationTestCase {
   func testAutoIndexCreationSetSuccessfully() throws {
-    // Use persistent disk cache (explict)
+    // Use persistent disk cache (explicit)
     let settings = db.settings
     settings.cacheSettings = PersistentCacheSettings()
     db.settings = settings