doc(add): corrects typos (#628)

* Typo: provier -> provider

Typo in `add.md`.

* Typo: omited -> omitted

Author: jackemerson

docs/cli/add.md

@@ -152,15 +152,15 @@ pnpm add https://github.com/zkochan/is-negative.git#2.0.1
 
 #### Install from a Git repository using hosting providers shorthand
 
-You can use a protocol shorthand `[provier]:` for certain Git providers:
+You can use a protocol shorthand `[provider]:` for certain Git providers:
 
 ```
 pnpm add github:zkochan/is-negative
 pnpm add bitbucket:pnpmjs/git-resolver
 pnpm add gitlab:pnpm/git-resolver
 ```
 
-If `[provider]:` is omited, it defaults to `github:`.
+If `[provider]:` is omitted, it defaults to `github:`.
 
 #### Install from a Git repository combining different parameters