Add explanations about the ! prefix in ignore files (v1.6.20)

.augmentignore

@@ -1,14 +1,8 @@
 # Augment ignore file
 # Additional patterns beyond .gitignore that should be ignored by Augment's context engine
 
-# Temporary files
-.temp-*
-
-# WordPress specific files
-wp-content/advanced-cache.php
-wp-content/object-cache.php
-wp-content/db.php
-wp-content/debug.log
+# You can use the ! prefix to include files that are excluded by .gitignore
+# Example: !important-file.log (This would include important-file.log even if *.log is in .gitignore)
 
 # Augment specific
 .augment-cache/