update ignore.md

cheatsheets/version-control/git/ignore.md

@@ -8,15 +8,15 @@ description: Reference for the Git ignore file
 
 ### File at all levels
 
-Ignores foo at all levels
+Ignores `foo` at any location.
 
 ```
 foo
 ```
 
 ### Fixed path
 
-Ignores `foo` at `/fizz/foo` in the repo root.
+Ignores `foo` only the root `fizz` directory.
 
 ```
 fizz/foo
@@ -26,9 +26,19 @@ This does **not** ignore a path like `abc/fizz/foo`, so see below.
 
 ### Path at any level
 
-ignores foo at fizz/foo, abc/fizz/foo, etc.
+Ignores `foo` in any `fizz` directory at any level in the directory hierarchy.
+
+e.g. `fizz/foo`, `abc/fizz/foo`.
 
 ```
 */fizz/foo
 ```
 
+## Extension
+
+Using the same rules as above but for a `.foo` file:
+
+- **`*.foo`**: Ignores all files with the `.foo` extension, regardless of their directory.
+- **`fizz/*.foo`**: Ignores files with the `.foo` extension only in the `fizz` directory at the root of the repository.
+- **`*/fizz/*.foo`**: Ignores files with the `.foo` extension in any `fizz` directory, no matter where the `fizz` directory is located within the repository.
+