Update qldoc and comments

Author: luchua-bc

java/ql/src/experimental/Security/CWE/CWE-600/UncaughtServletException.qhelp

@@ -29,7 +29,7 @@
       <a href="https://cwe.mitre.org/data/definitions/600.html">CWE-600: Uncaught Exception in Servlet</a>
     </li>
     <li>
-      Sonarsource:
+      SonarSource:
       <a href="https://rules.sonarsource.com/java/tag/owasp/RSPEC-1989">Exceptions should not be thrown from servlet methods</a>
     </li>
     <li>

java/ql/src/experimental/Security/CWE/CWE-600/UncaughtServletException.ql

@@ -26,7 +26,7 @@ class ThrowExConfiguration extends DataFlow2::Configuration {
 
   /** Sink of `ThrowStmt` */
   override predicate isSink(DataFlow::Node sink) {
-    exists(ThrowStmt ts | sink.asExpr() = ts.getExpr()) // e.g. the uhex exception throwed in `catch (UnknownHostException uhex) {throw uhex;}`
+    exists(ThrowStmt ts | sink.asExpr() = ts.getExpr()) // e.g. the uhex exception thrown in `catch (UnknownHostException uhex) {throw uhex;}`
   }
 
   /**