docs(catalog): add app to documentation; update config.d.ts

Signed-off-by: Benjamin Janssens <benji.janssens@gmail.com>

docs/integrations/github/discovery.md

@@ -288,9 +288,11 @@ If you do so, `default` will be used as provider ID.
     Whether to include archived repositories. Defaults to `false`.
 - **`host`** _(optional)_:
   The hostname of your GitHub Enterprise instance. It must match a host defined in [integrations.github](locations.md).
-- **`organization`**:
+- **`organization`** _(required, unless `app` is set)_:
   Name of your organization account/workspace.
-  If you want to add multiple organizations, you need to add one provider config each.
+  If you want to add multiple organizations, you need to add one provider config each or specify `app` instead.
+- **`app`** _(required, unless `organization` is set)_:
+  ID of your GitHub App.
 - **`validateLocationsExist`** _(optional)_:
   Whether to validate locations that exist before emitting them.
   This option avoids generating locations for catalog info files that do not exist in the source repository.

plugins/catalog-backend-module-github/config.d.ts

@@ -66,7 +66,7 @@ export interface Config {
              */
             organization?: string;
             /**
-             * (Required, unless `organization` is set) Name of your GitHub App.
+             * (Required, unless `organization` is set) ID of your GitHub App.
              */
             app?: string;
             /**
@@ -144,7 +144,7 @@ export interface Config {
                */
               organization?: string;
               /**
-               * (Required, unless `organization` is set) Name of your GitHub App.
+               * (Required, unless `organization` is set) ID of your GitHub App.
                */
               app?: string;
               /**