Fix typo (#4159)

fix typo in staging

Author: tlalfano

docs/develop/ruby/temporal-client.mdx

@@ -253,7 +253,7 @@ overrides the option set in the configuration file.
 
 :::
 
-For example, the following TOML configuration file defines a `staing` profile with the necessary connection options to
+For example, the following TOML configuration file defines a `staging` profile with the necessary connection options to
 connect to Temporal Cloud via an API key:
 
 For example, the following TOML configuration file defines a `staging` profile with the necessary connection options to