Preliminary Checks

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Summary

Hi team,

The following page for Creating a generic plugin is giving 404 - https://www.gatsbyjs.com/docs/creating-a-generic-plugin/

This is referenced here - https://www.gatsbyjs.com/docs/creating-plugins/

------------v3 site-------------------
Also has issues displaying commands, https://v3.gatsbyjs.com/docs/how-to/plugins-and-themes/creating-a-generic-plugin/, although they're present in markdown https://github.com/gatsbyjs/gatsby/blob/master/docs/docs/how-to/plugins-and-themes/creating-a-generic-plugin.md

Steps to Resolve this Issue

V5

1. Go to https://www.gatsbyjs.com/docs/creating-plugins/
2. Click on Creating a Generic Plugin

V3

1. Go to https://v3.gatsbyjs.com/docs/how-to/plugins-and-themes/creating-a-generic-plugin/
2. Check instructions, no commands are working
   ...