Use the DocC binary that ships with Xcode

Early on, TSPL depended on DocC features that had landed on that
repository's mainline development branch, but were too new to appear in
Xcode's DocC.  That hasn't been the case for a while now.  Removing the
need to locally compile DocC speeds up and simplifies the build process.

Author: amartini51

bin/publish-book

@@ -9,17 +9,6 @@
 # See https://swift.org/CONTRIBUTORS.txt for Swift project authors
 
 # Prepares a version of the book suitable for publication on swift.org.
-#
-# To use top-of-tree DocC, clone the following repositories:
-#
-#     https://github.com/apple/swift-docc
-#     https://github.com/apple/swift-docc-render
-#
-# Then set environment variables to paths in their working directories,
-# like the following, before running this script:
-#
-#     PATH=~/git/DocC/.build/arm64-apple-macosx/debug:$PATH
-#     DOCC_HTML_DIR=~/git/DocC-Renderer/dist/
 
 set -eux
 
@@ -36,7 +25,7 @@ cd "$(git rev-parse --show-toplevel)"
 # The published version of the book gets the swift.org header.
 cp -n TSPL.docc/header-publish.html TSPL.docc/header.html
 
-docc convert \
+xcrun docc convert \
     --experimental-enable-custom-templates \
     --hosting-base-path swift-book \
     --output-path "$output" \

bin/update-book-preview

@@ -14,19 +14,8 @@
 # This script should be run by someone with commit access to the 'gh-pages' branch
 # at a regular frequency so that the documentation content on the GitHub Pages site
 # is up-to-date with the content in this repo.
-#
-# To use top-of-tree DocC, clone the following repositories:
-#
-#     https://github.com/apple/swift-docc
-#     https://github.com/apple/swift-docc-render
-#
-# Then set environment variables to paths in their working directories,
-# like the following, before running this script:
-#
-#     PATH=~/git/DocC/.build/arm64-apple-macosx/debug:$PATH
-#     DOCC_HTML_DIR=~/git/DocC-Renderer/dist/
 
-set -eu
+set -eux
 
 REMOTE=${1:-origin}
 CURRENT_COMMIT_HASH="$(git rev-parse --short HEAD)"
@@ -46,7 +35,7 @@ export DOCC_JSON_PRETTYPRINT="YES"
 cp -n TSPL.docc/header-staging.html TSPL.docc/header.html
 
 # Build documentation, writing output in the gh-pages/docs subdirectory.
-docc convert \
+xcrun docc convert \
     --experimental-enable-custom-templates \
     --hosting-base-path swift-book \
     --output-path "./gh-pages/docs" \