RFR: 8257224: JDK-8251549 didn't update building.html

Wed Dec 2 10:05:03 UTC 2020

JDK-8251549 updated doc/building.md for building with git, but did not include corresponding updates to doc/building.html.

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Commit messages:
 - 8257224: JDK-8251549 didn't update building.html

Changes: https://git.openjdk.java.net/jdk/pull/1557/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=1557&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8257224
  Stats: 39 lines in 1 file changed: 4 ins; 23 del; 12 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1557.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1557/head:pull/1557

PR: https://git.openjdk.java.net/jdk/pull/1557