Swift: Address review comments.

Author: geoffw0

swift/ql/src/queries/Security/CWE-020/IncompleteHostnameRegex.ql

@@ -1,6 +1,6 @@
 /**
  * @name Incomplete regular expression for hostnames
- * @description Matching a URL or hostname against a regular expression that contains an unescaped dot as part of the hostname might match more hostnames than expected.
+ * @description Matching a URL or hostname against a regular expression that contains an unescaped dot as part of the hostname may match more hostnames than expected.
  * @kind problem
  * @problem.severity warning
  * @security-severity 7.8

swift/ql/src/queries/Security/CWE-020/IncompleteHostnameRegexBad.swift

@@ -5,7 +5,7 @@ func handleUrl(_ urlString: String) {
     let redirectParam = components?.queryItems?.first(where: { $0.name == "url" })
 
     // check we trust the host
-    let regex = #/^(www|beta).example.com//#
+    let regex = #/^(www|beta).example.com//#  // BAD
     if let match = redirectParam?.value?.firstMatch(of: regex) {
         // ... trust the URL ...
     }

swift/ql/src/queries/Security/CWE-020/IncompleteHostnameRegexGood.swift

@@ -5,7 +5,7 @@ func handleUrl(_ urlString: String) {
     let redirectParam = components?.queryItems?.first(where: { $0.name == "url" })
 
     // check we trust the host
-    let regex = #/^(www|beta)\.example\.com//#
+    let regex = #/^(www|beta)\.example\.com//#  // GOOD
     if let match = redirectParam?.value?.firstMatch(of: regex) {
         // ... trust the URL ...
     }