Fix links to Linux package prerequisites in WSL section

[MikeMcC399]

This PR fixes dead links in Guides > References > Advanced Installation > Windows Subsystem for Linux intended to point to Linux package prerequisites for running Cypress.

Currently, clicking on the links has no effect, since they refer to non-existent bookmarks on the same page. The PR changes the links to refer to the correct page:

• https://docs.cypress.io/guides/getting-started/installing-cypress

and correct bookmark names:

• #UbuntuDebian
• #CentOS

The generic bookmark:

• #Linux-Prerequisites

is added, since there are other Linux distributions listed other than Ubuntu/Debian and CentOS.

Linux is corrected to mixed case (reference https://www.kernel.org/linux.html).

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