Update type mapping sanitization READMEs to use backslash backreferen… #670

Job	Run time
gradle-tests	51m 24s
link-checker	6s
console-python-tests (lib/console_link)	31s
console-python-tests (cluster_tools)	2m 5s
node-tests (./deployment/cdk/opensearch-service-migration)	42s
python-e2e-tests	15m 38s
console-python-tests (console_api)	31s
node-tests (./deployment/migration-assistant-solution)	25s
python-lint	8s
style-check	46s
workflow-info	3s
all-ci-checks-pass	1s
	1h 12m 20s

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