FreeBSD/doc 5e18d48 (r53141)en_US.ISO8859-1/books/porters-handbook/versions chapter.xml, en_US.ISO8859-1/htdocs/releases/11.3R schedule.xml

Update the 11.3-RELEASE schedule to reflect RC1 builds have started.
Add the new releng/11.3 branch to the releng index page.
Add new __FreeBSD_versions for 11.3 to the Porter's Handbook.

Approved by:    re (implicit)
Sponsored by:   The FreeBSD Foundation
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+15-0en_US.ISO8859-1/books/porters-handbook/versions/chapter.xml
+7-0en_US.ISO8859-1/htdocs/releng/index.xml
+2-2en_US.ISO8859-1/htdocs/releases/11.3R/schedule.xml
+24-23 files

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