Update documentation

docs/pages/pmd/rules/apex.md

@@ -51,6 +51,7 @@ List of rulesets and rules contained in each ruleset.
 *   [ApexXSSFromURLParam](pmd_rules_apex_security.html#apexxssfromurlparam): Makes sure that all values obtained from URL parameters are properly escaped / sanitizedto avoid ...
 
 ## Style
+*   [AvoidDirectAccessTriggerMap](pmd_rules_apex_style.html#avoiddirectaccesstriggermap): Avoid directly accessing Trigger.old and Trigger.new as it can lead to a bug. Triggers should be ...
 *   [AvoidGlobalModifier](pmd_rules_apex_style.html#avoidglobalmodifier): Global classes should be avoided (especially in managed packages) as they can never be deleted or...
 *   [AvoidLogicInTrigger](pmd_rules_apex_style.html#avoidlogicintrigger): As triggers do not allow methods like regular classes they are less flexible and suited to apply ...
 *   [ClassNamingConventions](pmd_rules_apex_style.html#classnamingconventions): Class names should always begin with an upper case character.

docs/pages/pmd/rules/apex/performance.md

@@ -78,3 +78,4 @@ public class Something {
 ``` xml
 <rule ref="rulesets/apex/performance.xml/AvoidSoqlInLoops" />
 ```
+

docs/pages/pmd/rules/apex/style.md

@@ -20,7 +20,8 @@ Avoid directly accessing Trigger.old and Trigger.new as it can lead to a bug. Tr
 ```
 
 **Example(s):**
-``` 
+
+``` java
 trigger AccountTrigger on Account (before insert, before update) {
    Account a = Trigger.new[0]; //Bad: Accessing the trigger array directly is not recommended.