docs: remove internal build fixes from changelog (#14224)

* docs: remove internal build fixes from changelog

* d0d97c3 has been accidentally marked as `fix` while it should be `build`.
* a22a9fa has been re-added because we removed it manually from the changelog version (see [deduping logic](https://github.com/angular/material2/blob/master/tools/gulp/tasks/changelog.ts#L90))
* 985774a Same as for the commit above
* 150c964 Is _not_ a fix, and actually still internal because we miss documentation etc.

* Remove unrelated whitespace change

Author: devversion

CHANGELOG.md

@@ -96,11 +96,6 @@
 * **text-field:** autosize textarea not resizing on minRows decrease ([#13437](https://github.com/angular/material2/issues/13437)) ([cfeab79](https://github.com/angular/material2/commit/cfeab79))
 * **tooltip:** add fallback for touch devices if Hammer isn't loaded ([#13580](https://github.com/angular/material2/issues/13580)) ([5d54920](https://github.com/angular/material2/commit/5d54920)), closes [#13536](https://github.com/angular/material2/issues/13536)
 * **virtual-scroll:** not removing view from container if it's outside the template cache ([#13916](https://github.com/angular/material2/issues/13916)) ([8922100](https://github.com/angular/material2/commit/8922100)), closes [#13901](https://github.com/angular/material2/issues/13901)
-* bazel support for downstream apps ([#13836](https://github.com/angular/material2/issues/13836)) ([150c964](https://github.com/angular/material2/commit/150c964))
-* material not working with ES2015 ([#13709](https://github.com/angular/material2/issues/13709)) ([985774a](https://github.com/angular/material2/commit/985774a)), closes [#12760](https://github.com/angular/material2/issues/12760) [#13695](https://github.com/angular/material2/issues/13695)
-* reference symbols for example components rather than providing a string of the component name ([#13992](https://github.com/angular/material2/issues/13992)) ([d0d97c3](https://github.com/angular/material2/commit/d0d97c3))
-* workaround for es2015 inheritance not always working ([#13834](https://github.com/angular/material2/issues/13834)) ([a22a9fa](https://github.com/angular/material2/commit/a22a9fa))
-
 
 ### Features