Added explanation per anonymization type for documentation

Author: Jelle van Oosterbosch

Resources/doc/anonymizer.md

@@ -26,8 +26,12 @@ your_bundle_name.your_anonymizer:
 
 #### Type: fixed
 
+Anonymizes the property with a fixed value.
+
 ##### Simple fixed value 
 
+Setting an fixed value for the property.
+
 ```php
 <?php
 
@@ -56,6 +60,8 @@ use SuperBrave\GdprBundle\Annotation as GDPR;
 
 #### Type: dateTime
 
+Anonymizes the date time field by setting the month and day to 01 and hours, minutes and seconds to 00.
+
 ```php
 <?php
 
@@ -69,6 +75,8 @@ use SuperBrave\GdprBundle\Annotation as GDPR;
 
 #### Type: ip
 
+Anonymizes the ip address by zeroing the last bytes of an ipv4 or ipv6 address.
+
 ```php
 <?php
 
@@ -82,6 +90,8 @@ use SuperBrave\GdprBundle\Annotation as GDPR;
 
 #### Type: null
 
+Anonymizes the property by setting it to null.
+
 ```php
 <?php