docs: release notes for the v9.1.10 release

This commit contains the release notes from the 9.1.10 release. They were copy-pasted from the CHANGELOG in the 9.1.x branch.

CHANGELOG.md

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+<a name="9.1.10"></a>
+## [9.1.10](https://github.com/angular/angular/compare/9.1.9...9.1.10) (2020-06-09)
+
+
+### Bug Fixes
+
+* **elements:** fire custom element output events during component initialization ([454e073](https://github.com/angular/angular/commit/454e073)), closes [/github.com/angular/angular/blob/c0143cb2abdd172de1b95fd1d2c4cfc738640e28/packages/elements/src/create-custom-element.ts#L167-L170](https://github.com//github.com/angular/angular/blob/c0143cb2abdd172de1b95fd1d2c4cfc738640e28/packages/elements/src/create-custom-element.ts/issues/L167-L170) [/github.com/angular/angular/blob/c0143cb2abdd172de1b95fd1d2c4cfc738640e28/packages/elements/src/create-custom-element.ts#L164](https://github.com//github.com/angular/angular/blob/c0143cb2abdd172de1b95fd1d2c4cfc738640e28/packages/elements/src/create-custom-element.ts/issues/L164) [/github.com/angular/angular/blob/c0143cb2abdd172de1b95fd1d2c4cfc738640e28/packages/elements/src/component-factory-strategy.ts#L158](https://github.com//github.com/angular/angular/blob/c0143cb2abdd172de1b95fd1d2c4cfc738640e28/packages/elements/src/component-factory-strategy.ts/issues/L158) [#36141](https://github.com/angular/angular/issues/36141)
+
+
+### Performance Improvements
+
+* **ngcc:** cache parsed tsconfig between runs ([1aae94a](https://github.com/angular/angular/commit/1aae94a)), closes [#37417](https://github.com/angular/angular/issues/37417) [#36882](https://github.com/angular/angular/issues/36882)
+
+
+
 <a name="10.0.0-rc.3"></a>
 # [10.0.0-rc.3](https://github.com/angular/angular/compare/10.0.0-rc.2...10.0.0-rc.3) (2020-06-08)