[doc] Fix background in block diagram #993

	# Copyright lowRISC contributors.
	# Licensed under the Apache License, Version 2.0, see LICENSE for details.
	# SPDX-License-Identifier: Apache-2.0

	# GitHub Action to run Verible linting on pull requests and add review comments.
	#
	# See https://github.com/chipsalliance/verible-linter-action.

	name: pr-lint-review

	# Triggers when there is any activity on a pull request, e.g. opened, updated.
	#
	# The action runs in the context of the _base_ of the pull request, but later we
	# checkout the repository at the pull request's HEAD to run linting.
	on:
	pull_request_target:

	jobs:
	verible-lint:
	runs-on: ubuntu-latest
	# Grant write permissions only for setting checks and adding review comments
	# to pull requests.
	permissions:
	checks: write
	contents: read
	pull-requests: write
	env:
	verible_config: 'vendor/lowrisc_ip/lint/tools/veriblelint/lowrisc-styleguide.rules.verible_lint'
	steps:
	- uses: actions/checkout@v3
	with:
	# Because `pull_request_target` runs at the PR's base, we need to
	# checkout the head of the PR before running the lint.
	ref: ${{ github.event.pull_request.head.sha }}
	- name: Display Verible config
	run: \|
	echo "::group::Verible config"
	cat "$verible_config"
	echo "::endgroup::"
	- name: Run Verible linter action
	uses: chipsalliance/verible-linter-action@main
	with:
	github_token: ${{ secrets.GITHUB_TOKEN }}
	suggest_fixes: 'false'
	config_file: ${{ env.verible_config }}

Provide feedback