perlre: Clarify /x eol can't be escaped

(cherry picked from commit 8be3c4ca13376174c7c23f3a85d05cb2920d9170)
pod/perlre.pod: fix typo in example code

(cherry picked from commit 22dc67195d1219cb0c80b695155d55bcfafa1551)
add the standards of conduct to perlpolicy

(cherry picked from commit 17c80487b48847f88d152c5ea537f4fd68291fb3)
perlpolicy - Note that minimal build fixes are acceptable for maint too

Changes like 31114fe991, which has just been cherry-picked into maint-5.20,
should be allowed.

(cherry picked from commit bd21af11d4fd0396606700004aa5eb68a654ff6c)
perlpolicy: update list of moderators

(cherry picked from commit 0c6082f4114551048a119c8b2c9dc455bd071751)
perlpolicy - Add encoding to fix podcheck.t following 0c6082f411

(cherry picked from commit 3db23aeceed93497d1456928f0d3561a32f74a02)
Warn against tmpfile, and mention perlclib.

(cherry picked from commit bbc89b61fda2c0d03d0a57a32abcf992fcf30e99)
perlop: Grammatical nit.

'either' refers only to one of two possibilities.  Since this
has more than that, 'either' is grammatically incorrect.

(cherry picked from commit 5cc4165376630d8930e99d7864bd63d1e70853f5)
Add new release to perlhist

(cherry picked from commit 62406c838c92e5d5cbf29c4f06850350380f4ef5)
Add new release to perlhist

(cherry picked from commit 0f824be90600ec3504034b0173fa6b67f3a4d4e8)
File::Copy does not overwrite read-only files

(cherry picked from commit ed9113faaa67f462b522e2da6b13ae131fea4cee)