8362244: Devkit's Oracle Linux base OS keyword is incorrectly documented

[vy]

open/doc/building.md uses the incorrect OEL6 keyword to denote the Oracle Enterprise Linux base OS distribution for Devkit – replaced it with the correct one instead, i.e., OL.

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Issue

• JDK-8362244: Devkit's Oracle Linux base OS keyword is incorrectly documented (Bug - P4)

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[mlbridge]

Webrevs

• 02: Full - Incremental (18199384)
• 01: Full - Incremental (0d85899a)
• 00: Full (d267739d)

[vidmik]

You also need to regenerate the corresponding building.html using the update-build-docs make target

[vidmik]

Also unrelated but maybe worth fixing: the default Fedora version is 41 nowadays.

[vy]

In 0d85899, I've removed the entire (with ... as default version) snippet – I doubt if it is worth the effort of trying to keep up with that variable, i.e., the Fedora version. We neither share it for OL. Please let me know if you agree or disagree.