docs: add global arg for wrangler --cmd (#19665)

* docs: add global arg for wrangler `--cmd`

* update description

---------

Co-authored-by: Carmen Popoviciu <[email protected]>

Author: pi0

src/content/partials/workers/wrangler-commands/global-flags.mdx

@@ -9,4 +9,6 @@ The following global flags work on every command:
 - `--help` <Type text="boolean" />
   - Show help.
 - `--config` <Type text="string" /> (not supported by Pages)
-  - Path to your [Wrangler configuration file](/workers/wrangler/configuration/).
+  - Path to your [Wrangler configuration file](/workers/wrangler/configuration/).
+- `--cwd` <Type text="string" />
+  - Run as if Wrangler was started in the specified directory instead of the current working directory.