Integrated: Add material about updating the CSR when a backout occurs.

[Stuart Marks]

On Wed, 9 Apr 2025 21:28:38 GMT, Stuart Marks <smarks at openjdk.org> wrote:

> Also, add a small fix to the Makefile.

This pull request has now been integrated.

Changeset: 71fbb94b
Author:    Stuart Marks <smarks at openjdk.org>
URL:       https://git.openjdk.org/guide/commit/71fbb94b0b7b3ca75869bc158805971a3fe3d3df
Stats:     6 lines in 2 files changed: 4 ins; 0 del; 2 mod

Add material about updating the CSR when a backout occurs.

Reviewed-by: jwilhelm, darcy, liach

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PR: https://git.openjdk.org/guide/pull/148