docs: branding fixes (#14132)

Angular 1.x -> AngularJS
Angular 1 -> AngularJS
Angular1 -> AngularJS
Angular 2+ -> Angular
Angular 2.0 -> Angular
Angular2 -> Angular

I have deliberately not touched any of the symbol names as that would cause big merge collisions with Tobias's work.

All the renames are in .md, .json, and inline comments and jsdocs.

PR Close #14132

modules/benchmarks/src/tree/ng2_ftl/app.ngfactory.ts

@@ -1,5 +1,5 @@
 /**
- * This file is generated by the Angular 2 template compiler.
+ * This file is generated by the Angular template compiler.
  * Do not edit.
  */
 /* tslint:disable */

modules/benchmarks/src/tree/ng2_ftl/tree.ngfactory.ts

@@ -1,6 +1,6 @@
 /**
  * This file is hand tweeked based on
- * the out put of the Angular 2 template compiler
+ * the out put of the Angular template compiler
  * and then hand tweeked to show possible future output.
  */
 /* tslint:disable */

modules/benchmarks/src/tree/ng2_ftl/tree_host.ngfactory.ts

@@ -1,5 +1,5 @@
 /**
- * This file is generated by the Angular 2 template compiler.
+ * This file is generated by the Angular template compiler.
  * Do not edit.
  */
 /* tslint:disable */

modules/benchmarks/src/tree/ng2_next/README.md

@@ -1,6 +1,6 @@
 # Ng2 Next Benchmark
 
-This benchmark uses the upcoming view engine for Angular 2, which moves
+This benchmark uses the upcoming view engine for Angular, which moves
 more functionality from codegen into runtime to reduce generated code size.
 
 As we introduce more runtime code, we need to be very careful to not

modules/benchmarks/src/tree/ng2_static_ftl/app.ngfactory.ts

@@ -1,5 +1,5 @@
 /**
- * This file is generated by the Angular 2 template compiler.
+ * This file is generated by the Angular template compiler.
  * Do not edit.
  */
 /* tslint:disable */

modules/benchmarks/src/tree/ng2_static_ftl/tree_branch.ngfactory.ts

@@ -1,6 +1,6 @@
 /**
  * This file is hand tweeked based on
- * the out put of the Angular 2 template compiler
+ * the out put of the Angular template compiler
  * and then hand tweeked to show possible future output.
  */
 /* tslint:disable */

modules/benchmarks/src/tree/ng2_static_ftl/tree_leaf.ngfactory.ts

@@ -1,6 +1,6 @@
 /**
  * This file is hand tweeked based on
- * the out put of the Angular 2 template compiler
+ * the out put of the Angular template compiler
  * and then hand tweeked to show possible future output.
  */
 /* tslint:disable */

modules/benchmarks/src/tree/ng2_static_ftl/tree_root.ngfactory.ts

@@ -1,5 +1,5 @@
 /**
- * This file is generated by the Angular 2 template compiler.
+ * This file is generated by the Angular template compiler.
  * Do not edit.
  */
 /* tslint:disable */