Improve package manager update docs

[Bargs]

Included instructions for versions before and after 4.5.4. When upgrading from versions older than 4.5.4, it's advisable to remove and reinstall rather than upgrade due to bugs in the packages in older versions.

[Bargs]

@jbudz now that I look at this one more time, I'm still not sure it's as clear as it could be. The first two steps (update the repo url, run apt-get update) are applicable to all versions of Kibana if you're switching major minor versions, is that correct?

The only difference between >=4.5.4 and <4.5.4 is that after updating the repo url (if necessary), the former will only need to run apt-get install kibana whereas the latter will need to remove/reinstall?

[jbudz]

Yes, when switching minor versions and the major version 4. And then after updating the repo url, only when upgrading, it's easiest to remove/install instead of doing the permissions dance. My only comment on this might be to say something along the lines of 'when upgrading rpm or deb packages...` for the title to clarify that this doesn't cover the .tar.gzs, and does cover the deb and rpm files in addition to the repo.

[Bargs]

@jbudz I tried to clarify things further, let me know what you think

[jbudz]

to upgrade using linux packages?

[Bargs]

Good idea, made the update

[jbudz]

Small comment above, otherwise LGTM.