Bug 1349727 added important box about changing fstype field

[bfallonf]

As per: https://bugzilla.redhat.com/show_bug.cgi?id=1349727#c0

I'll ask for an ack in the BZ.

[bfallonf]

Ack given.

@tpoitras @ahardin-rh @adellape @tnguyen-rh Peer review plz?

[bfallonf]

[rev_history]
|xref:../install_config/persistent_storage/index.adoc[Configuring Persistent Storage]
|Added important box about changing fstype field in a persistent volume configuration in several files.
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[tpoitras]

I thought we were supposed to avoid wording things as "recommendations" and instead just tell them why something is a bad idea?

"Changing the value of the fstype parameter after the volume has been formatted and provisioned can result in data loss and pod failure."

[tpoitras]

@bfallonf left some notes, you can probably ignore my corrections of "s/will format/formats" if you want, because you're quantify the "when" with "before...", but changing it as I've noted will future-proof it against accidentally lapsing into unnecessary future tense if the sentence is reworded and the before is removed.

[bfallonf]

@tpoitras Nah, I agree with all you said. Thanks for the review. I will merge.