Documentation: Update and improve templates/gitignores.html

doc/api/templates/gitignores.md

@@ -12,10 +12,12 @@ information on `gitignore`, see the
 
 Get all `.gitignore` templates.
 
-```
+```plaintext
 GET /templates/gitignores
 ```
 
+Example request:
+
 ```bash
 curl https://gitlab.example.com/api/v4/templates/gitignores
 ```
@@ -111,14 +113,16 @@ Example response:
 
 Get a single `.gitignore` template.
 
-```
+```plaintext
 GET /templates/gitignores/:key
 ```
 
 | Attribute  | Type   | Required | Description                          |
-| ---------- | ------ | -------- | ----------- |
+| ---------- | ------ | -------- | ------------------------------------ |
 | `key`      | string | yes      | The key of the `.gitignore` template |
 
+Example request:
+
 ```bash
 curl https://gitlab.example.com/api/v4/templates/gitignores/Ruby
 ```