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

Tue Jul 15 10:02:29 UTC 2025

`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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Commit messages:
 - Fix OL-related base OS keywords in Devkit docs

Changes: https://git.openjdk.org/jdk/pull/26311/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=26311&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8362244
  Stats: 3 lines in 1 file changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/26311.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26311/head:pull/26311

PR: https://git.openjdk.org/jdk/pull/26311