Changed severity for 3 rules as suggested by Bot

Author: ESS-ENN

rules/c/security/libxml2-audit-parser-c.yml

@@ -1,6 +1,6 @@
 id: libxml2-audit-parser-c
 language: c
-severity: info
+severity: warning
 message: >-
   The libxml2 library is used to parse XML. When auditing such code, make
   sure that either the document being parsed is trusted or that the parsing

rules/cpp/security/libxml2-audit-parser-cpp.yml

@@ -1,6 +1,6 @@
 id: libxml2-audit-parser-cpp
 language: Cpp
-severity: info
+severity: warning
 message: >-
   The libxml2 library is used to parse XML. When auditing such code, make
   sure that either the document being parsed is trusted or that the parsing

rules/csharp/security/httponly-false-csharp.yml

@@ -1,6 +1,6 @@
 id: httponly-false-csharp
 language: csharp
-severity: info
+severity: warning
 message: >-
   "Detected a cookie where the `HttpOnly` flag is either missing or
       disabled. The `HttpOnly` cookie flag instructs the browser to forbid