docs: add docs about duplicating rules and bundle components (#2812)

Author: AlbinaBlazhko17

CONTRIBUTING.md

@@ -178,6 +178,7 @@ The defaults are `off` or `warn` for `minimal` and `recommended` and `error` for
 Also add the rule to the built-in rules list in [the config types tree](./packages/core/src/types/redocly-yaml.ts).
 
 If the rule reflects a specification requirement, prefix it with `spec-` and add it to the [spec ruleset](./packages/core/src/config/spec.ts).
+If a rule already exists for another specification flavor, reuse the existing name so the same concept stays discoverable across specs.
 
 Separately, open a merge request with the corresponding documentation changes.
 To make changes to documentation:

docs/@v2/commands/bundle.md

@@ -11,6 +11,7 @@ The `bundle` command pulls the relevant parts of an API description into a singl
 
 The `bundle` command differs from the [`join`](./join.md) command.
 The `bundle` command takes a root OpenAPI file as input and follows the `$ref` mentions to include all the referenced components into a single output file.
+All components are automatically resolved and included without requiring explicit definitions.
 The `join` command can combine multiple OpenAPI files into a single unified API description file.
 
 The `bundle` command first executes preprocessors, then rules, then decorators.