docs: clarify pipe naming (#31806)

PR Close #31806

aio/content/guide/styleguide.md

@@ -1080,6 +1080,10 @@ For example, the prefix `toh` represents **T**our **o**f **H**eroes and the pref
 
 
 **Do** use consistent names for all pipes, named after their feature.
+The pipe class name should use [UpperCamelCase](guide/glossary#case-types)
+(the general convention for class names),
+and the corresponding `name` string should use *lowerCamelCase*.
+The `name` string cannot use hyphens ("dash-case" or "kebab-case").
 
 
 </div>

packages/core/src/metadata/directives.ts

@@ -589,6 +589,8 @@ export interface PipeDecorator {
    * to a template. To make it a member of an NgModule,
    * list it in the `declarations` field of the `NgModule` metadata.
    *
+   * @see [Style Guide: Pipe Names](guide/styleguide#02-09)
+   *
    */
   (obj: Pipe): TypeDecorator;
 
@@ -606,7 +608,8 @@ export interface PipeDecorator {
 export interface Pipe {
   /**
    * The pipe name to use in template bindings.
-   *
+   * Typically uses [lowerCamelCase](guide/glossary#case-types)
+   * because the name cannot contain hyphens.
    */
   name: string;