Merged PRs to document

[ephys]

I'm using this issue as a way to track which PRs implemented changes that need to be documented on the website

• feat(mssql): add json operations support sequelize#15832: Indicate that mssql supports a subset of JSON querying
• feat: add support for model inheritance sequelize#16095:
  • Document how model inheritance works & its limits
  • Document abstract models
• feat: add timestamp & version attribute decorators sequelize#15767
• Upgrade MariaDB connector to v3 sequelize#14379: minimum mariadb npm package version
• feat: add sequelize.withConnection, rename sequelize.set to sequelize.setSessionVariables sequelize#15851
  • document how to reserve a connection with withConnection, and why
  • document the breaking change: sequelize.set renamed to sequelize.setSessionVariables
• feat: add nestMode option for managed transactions sequelize#16143
• feat: migrate version queries to typescript sequelize#16153 (breaking changes)
• feat: parse URLs using WHATWG URL API instead of legacy URL API sequelize#16927

[ephys]

I'm closing this issue in favor of adding these PRs to this project: https://github.com/orgs/sequelize/projects/5/views/1