Fix limits docs to reflect listener variable name (#13776)

website/content/docs/internals/limits.mdx

@@ -229,7 +229,7 @@ This limit depends on the key size.
 ### Request size
 
 The maximum size of an HTTP request sent to Vault is limited by
-the `maximum_request_size` option in the [listener stanza](/docs/configuration/listener/tcp). It defaults to 32 MiB. This value, minus the overhead of
+the `max_request_size` option in the [listener stanza](/docs/configuration/listener/tcp). It defaults to 32 MiB. This value, minus the overhead of
 the HTTP request itself, places an upper bound on any Transit operation,
 and on the maximum size of any key-value secrets.