docs: apply standard header case convention (#34196)

PR Close #34196

aio/content/guide/glossary.md

@@ -478,6 +478,15 @@ or displayed between element tags, as in this example.
 
 Read more about [interpolation](guide/template-syntax#interpolation) in [Template Syntax](guide/template-syntax).
 
+{@a ivy}
+
+## Ivy
+
+Ivy is the code name for Angular's [next-generation compilation and rendering pipeline](https://blog.angular.io/a-plan-for-version-8-0-and-ivy-b3318dfc19f7).
+With the version 9 release of Angular, the new compiler and runtime instructions are used by default instead of the older compiler and runtime, known as [View Engine](#ve).
+
+See [Angular Ivy](guide/ivy).
+
 
 {@a J}
 
@@ -572,6 +581,14 @@ Compare to [NgModule](#ngmodule).
 
 {@a N}
 
+{@a ngcc}
+
+## ngcc (Angular Compatability Compiler)
+
+The CLI automatically runs the `ngcc` process to compile all your libraries with [Ivy](#ivy).
+If your app uses Ivy, but depends on libraries that don't use Ivy, `ngcc` automatically updates the dependent libraries to use Ivy when you compile your app.
+
+
 {@a ngmodule}
 
 ## NgModule
@@ -951,6 +968,13 @@ You can change the structure of elements by inserting, moving, or removing neste
 
 View hierarchies can be loaded and unloaded dynamically as the user navigates through the application, typically under the control of a [router](#router).
 
+{@a ve}
+
+## View Engine
+
+The compilation and rendering pipeline used by Angular before version 9. Compare [Ivy](#ivy).
+
+
 {@a view-tree}
 
 ## view hierarchy