fix path instructions example

Author: harjotgill

docs/guides/configure-coderabbit.md

@@ -33,7 +33,7 @@ reviews:
   review_status: true
   collapse_walkthrough: false
   path_filters:
-    - "!**/.xml"
+    - "!**/*.xml"
   path_instructions:
     - path: "**/*.js"
       instructions:

docs/guides/review-instructions.md

@@ -47,6 +47,13 @@ reviews:
 
 ## Abstract Syntax Tree (AST) based instructions {#ast-based}
 
+CodeRabbit offers review instructions based on Abstract Syntax Tree (AST)
+patterns. Under the hood, CodeRabbit uses
+[`ast-grep`](https://ast-grep.github.io) to power this feature. `ast-grep` is
+written in Rust and uses the tree-sitter parser to generate the AST for popular
+languages. `ast-grep` is written and maintained by
+[Herrington Darkholme](https://twitter.com/hd_nvim).
+
 :::note
 
 The additional context provided by this feature is only available during the