fix(api): swagger docs improvement (#13082)

This PR fixes some minor issues with the swagger API documentation. These issues are:

1. The description for the `template` parameter for the `GET /repo/search` endpoint is incorrect. It says this:
    ```
    include template repositories this user has access to (defaults to true)
    ```
    When the parameter actually functions like this:
    ```
    show only template, non-template or all repositories (defaults to all)
    ```
2. The the `gitignores` option in the `POST /user/repos` endpoint JSON object has a description that doesn't say how `gitignore` names should be separated. It's like this:
    ```
    Gitignores to use
    ```
    When it should be something like this:
    ```
    Gitignores to use, separated by commas
    ```

Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/13082
Reviewed-by: Michael Kriese <michael.kriese@gmx.de>
Reviewed-by: 0ko <0ko@noreply.codeberg.org>

modules/structs/repo.go

@@ -151,7 +151,7 @@ type CreateRepoOption struct {
 	AutoInit bool `json:"auto_init"`
 	// Whether the repository is template
 	Template bool `json:"template"`
-	// Gitignores to use
+	// Gitignores to use, separated by commas
 	Gitignores string `json:"gitignores"`
 	// License to use
 	License string `json:"license"`

routers/api/v1/repo/repo.go

@@ -90,7 +90,7 @@ func Search(ctx *context.APIContext) {
 	//   type: boolean
 	// - name: template
 	//   in: query
-	//   description: include template repositories this user has access to (defaults to true)
+	//   description: show only template, non-template or all repositories (defaults to all)
 	//   type: boolean
 	// - name: archived
 	//   in: query

templates/swagger/v1_json.tmpl

@@ -5414,7 +5414,7 @@
           },
           {
             "type": "boolean",
-            "description": "include template repositories this user has access to (defaults to true)",
+            "description": "show only template, non-template or all repositories (defaults to all)",
             "name": "template",
             "in": "query"
           },
@@ -25306,7 +25306,7 @@
           "x-go-name": "Description"
         },
         "gitignores": {
-          "description": "Gitignores to use",
+          "description": "Gitignores to use, separated by commas",
           "type": "string",
           "x-go-name": "Gitignores"
         },