Update README.md
Merge branch 'develop' of https://github.com/magento/devdocs into DevDocs-19-M8
Removed duplicate highlight mentioning PHP and MySQL
Changed URL ID sequence to account from removing duplicate
Known issues in sections, corrected issues with sample data
Merge pull request #456 from Magento/develop

Known issues in sections, corrected issues with sample data
Merge branch 'master' of github.com:magento/devdocs into develop
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/develop' into develop
Merge pull request #91 from chadbean/develop

Removed duplicate highlight mentioning PHP and MySQL
PR 91 by chadbean, also clarified some known issues
Merge pull request #457 from Magento/develop

PR 91 by chadbean and hot fix to Release Notes
Merge remote-tracking branch 'upstream/master'