docs: update docs for rule filename-blocklist

Author: dukeluo

docs/rules/filename-blocklist.md

@@ -29,6 +29,10 @@ src/foo.models.ts
 src/bar.models.ts
 ```
 
+:warning: :warning: :warning:
+
+**Versions <= v2.0.0 can only select target files by their filenames, not by their paths. This support has been deprecated and will be removed  in the future. Please select your target files by their file path. For example, using `**/*.js` instead of `*.js` to select all `js` files.**
+
 
 ### Options
 

lib/rules/filename-blocklist.js

@@ -63,6 +63,9 @@ module.exports = {
         )) {
           const matchResult =
             matchRule(filenameWithPath, blockListPattern) ||
+            // legacy support for versions <= 2.0.0
+            // file only can be specified by its filename, not by file path pattern
+            // it's a legacy feature, will be removed in the future
             matchRule(filename, blockListPattern);
 
           if (matchResult) {