Rust: Apply qhelp suggestions from review

Co-authored-by: mc <42146119+mchammer01@users.noreply.github.com>

Author: paldepind

rust/ql/src/queries/security/CWE-311/CleartextTransmission.qhelp

@@ -29,7 +29,7 @@ cleartext, and should not contain sensitive information.
 
 <p>
 In the 'GOOD' cases, the data is either not sensitive, or is protected with
-encryption. When encryption is used, take care to select a secure modern
+encryption. When encryption is used, ensure that you select a secure modern
 encryption algorithm, and put suitable key management practices into place.
 </p>
 
@@ -40,7 +40,7 @@ encryption algorithm, and put suitable key management practices into place.
 
 <li>
   OWASP Top 10:2021:
-  <a href="https://owasp.org/Top10/A02_2021-Cryptographic_Failures/">A02:2021 � Cryptographic Failures</a>.
+  <a href="https://owasp.org/Top10/A02_2021-Cryptographic_Failures/">A02:2021 - Cryptographic Failures</a>.
 </li>
 <li>
   OWASP: