unbreak redex pdf docs build

please include in the release

(cherry picked from commit 098d17b524b180511c661956a3b44193293eced2)
Update TR history.

Please merge to 6.1.1.

(cherry picked from commit 66e5a246c42dd585be9e42b280c0338de1e30892)
note v6.1.1 in Racket "HISTORY.txt"

Merge to v6.1.1

(cherry picked from commit 3a3ffe1efa32aba8f3fa7db41eff23ca54a4276e)
update history for 6.1.1

please include in the release

(cherry picked from commit b3110feabd9c37eb28fa60da54c4f8dd955bf221)
update Redex HISTORY.txt

please include in the 6.1.1 release

(cherry picked from commit b19f5a34eea0c095c57b88ffe8ed33cb5c76836d)
fix types of stx->list, stx-car, etc.

(cherry picked from commit 56faac79c47d39626c3cc30cfab808e0524a722d)
test types for typed/syntax/stx

(cherry picked from commit 4c22029f0616611c826f10fc2d3320a1ab32d48b)
add comments about (Syntaxof Syntax-E)

(cherry picked from commit 3d88e7c6630806275bcfdab33d379c43a59094d8)
add types for Stx-Null, Stx-Pairof, and Stx-Listof

(cherry picked from commit 92f5b37ae231ef4521de91b2724041e0ff928f98)
adjust docs for drracket/check-syntax so the example
doesn't include paths directly into the plt tree

please include on the release branch.

(cherry picked from commit bbd9c432b69f5d582ca260e3bef009fc21191fc6)
eliminated bug introduced with latest revision

please add to 6.1.1.

(cherry picked from commit 538bb75d646b42acbdf98a762687419707f4f5dc)

Conflicts:
	pkgs/htdp-pkgs/htdp-lib/test-engine/racket-tests.rkt
Fix types for foldl and foldr with 3 lists.

Thanks to Jack Firth for the report.

(cherry picked from commit 9030680e312c54522bdd801c6113400535c1965a)
Fix type for stx->list in typed/syntax/stx

Please merge to v6.1.1

(cherry picked from commit 125d993c64bd71ec83109717e029f0e7da4699e3)
Fix Guide typo

Please merge to v6.1.1

(cherry picked from commit 2bad36a6a1a7068f1601a21db4f553777aad7b67)
Fix TR docs on #:implements in Class types

Please merge to v6.1.1

(cherry picked from commit 3b006df29d3b74428fbc2e3a33a53f36fb400753)
openssl: fix `ssl-load-default-verify-sources!` for Win64

Closes PR 14784

Merge to v6.1.1

(cherry picked from commit 99832efb452ccbd1266b617d64ed3385553984cd)