docs: add example for nest add and nest info

Author: Zerotask

content/cli/usages.md

@@ -156,6 +156,10 @@ $ nest add <name> [options]
 
 Updates `@nestjs` dependencies in the `package.json` `"dependencies"` list to their `@latest` version.
 
+```bash
+$ nest update [options]
+```
+
 ##### Options
 
 | Option    | Description                                                              |
@@ -167,6 +171,10 @@ Updates `@nestjs` dependencies in the `package.json` `"dependencies"` list to th
 
 Displays information about installed nest packages and other helpful system info. For example:
 
+```bash
+$ nest info
+```
+
 ```bash
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