Update wrong documentation regarding variables in dynamic auth

Author: k4z4n0v4

tools/nuclei/authenticated-scans.mdx

@@ -141,9 +141,9 @@ dynamic:
     # A example dynamic login of Wordpress using REST API
   - template: /path/to/wordpress-login.yaml
     variables:
-      - name: username
+      - key: username
         value: pdteam
-      - name: password
+      - key: password
         value: nuclei-fuzz
     input: auth-server.projectdiscovery.io # optional input/target, not required if target is hardcoded in template
     # once login is successful, this can be used in below templatized static secret
@@ -351,9 +351,9 @@ Example:
 
 ```yaml
 variables:
-  - name: username
+  - key: username
     value: pdteam
-  - name: password
+  - key: password
     value: nuclei-fuzz
 ```