MINOR: Fix typo

Author: olgabrani

README.md

@@ -686,7 +686,7 @@ git diff --staged
 
 ## Extract file from another branch.
 ```sh
-git show <banch_name>:<file_name>
+git show <branch_name>:<file_name>
 ```
 
 ## List only the root and merge commits.

tips.json

@@ -304,7 +304,7 @@
    "tip": "git diff --staged"
 },{
 	"title": "Extract file from another branch.",
-	"tip": "git show <banch_name>:<file_name>"
+	"tip": "git show <branch_name>:<file_name>"
 }, {
 	"title": "List only the root and merge commits.",
   "tip": "git log --first-parent"