docs: Add example and fix typo for readme of regex versioning module

[kennethso168]

Changes

This adds an example for linuxserver/tautulli docker image to show that for the fourth version part (the ls number), the build capture group should be used. This differs from the current example of linuxserver/openssh-server which the ls number is the fifth version part so versioning should be used. Closes #33270.

Also fixes typo in the doc (should be matchPackageNames instead of matchPackageNamees)

Context

I have opened an discussion #33270 while attempting to adapting the linuxserver/openssh-server example for linuxserver/librespeed. Afterwards the maintainer replied that the build instead of versioning capture group should be used for the fourth versioning part (the ls number).

I think most linuxserver.io image tags follow semver plus build number (x.y.z-lsnn). ghcr.io/linuxserver/openssh-server is a particularly difficult case with the five capture groups. I think it is a good idea to add an additional example to show how to handle linuxserver.io image tags in the format of x.y.z-lsnn. I believe that this will let beginners to get started to use renovate with most linuxserver.io images. This will also clearly demonstrate that when only four version parts are needed, build instead of revision should be used for the fourth capture group.

I choose tautulli as an example as this is the fourth most pulled linuxserver image according to their stats. The version tag prefixed with v also further demonstrates a difference with openssh-server.

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