Update documentation for v1.18 release #721

	name: Validate content with Vale

	on:
	pull_request:
	paths:
	- 'content/**'

	# Allows manual workflow run (must in default branch to work)
	workflow_dispatch:

	jobs:
	lint-content:
	runs-on: ubuntu-latest
	steps:
	- name: Checkout the docs repo
	uses: actions/checkout@v3

	- name: Get changed files
	id: changed-files
	uses: tj-actions/changed-files@v35
	with:
	files: content/**

	- name: Install Vale
	env:
	VALE_VERSION: "3.7.1"
	run: wget https://github.com/errata-ai/vale/releases/download/v${{env.VALE_VERSION}}/vale_${{env.VALE_VERSION}}_Linux_64-bit.tar.gz && tar -xvzf vale_${{env.VALE_VERSION}}_Linux_64-bit.tar.gz

	- name: Run Vale
	if: steps.changed-files.outputs.any_changed == 'true'
	# Run vale and display the output. Fail if the output is greater than 1 line.
	# Vale uses a 0 return code for warnings and suggestions. These should be considered failures.
	run: \|
	./vale --config="./utils/vale/.vale.ini" ${{ steps.changed-files.outputs.all_changed_files }} \| tee /dev/stderr \| wc -l \| { read wc; test $wc -eq 1; }

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