docs(configuration): add snapshot.unmanagedPaths (#7120)

Author: snitin315

src/content/configuration/other-options.mdx

@@ -397,6 +397,7 @@ module.exports = {
   snapshot: {
     managedPaths: [path.resolve(__dirname, '../node_modules')],
     immutablePaths: [],
+    unmanagedPaths: [],
     buildDependencies: {
       hash: true,
       timestamp: true,
@@ -462,6 +463,16 @@ module.exports = {
 };
 ```
 
+### unmanagedPaths
+
+<Badge text="5.90.0+" />
+
+`(RegExp | string)[]`
+
+An array of paths that are not managed by a package manager and the contents are subject to change.
+
+Make sure to wrap the path in a capture group if you use regular expressions.
+
 ### module
 
 `object = {hash boolean = true, timestamp boolean = true}`