Update README

Add description that string of elements of topics must not include
spaces

Author: noraworld

README/en.md

@@ -99,7 +99,7 @@ Your Markdown articles need to include a YAML header like this.
 ```yaml
 ---
 title: "Your awesome title"
-topics: ["GitHub Actions", "Ruby", "YAML"]
+topics: ["GitHubActions", "Ruby", "YAML"]
 published: true
 ---
 
@@ -109,7 +109,7 @@ Your article starts here.
 | Key         | Description                                                     | Type                                   | Constraint   |
 | ----------- | --------------------------------------------------------------- | -------------------------------------- | ------------ |
 | `title`     | Specify a title of an article                                   | `String`                               |              |
-| `topics`    | Specify tags of an article that describes its attributes        | `Array[String, <String, String, ...>]` | Up to 5 tags |
+| `topics`    | Specify tags of an article that describes its attributes        | `Array[String, <String, String, ...>]` | • Up to 5 tags<br>• The string of the elements must not include spaces |
 | `published` | Specify whether an article will be posted publicly or privately | `Boolean`                              |              |
 
 Note that your article file must start with `---`.

README/ja.md

@@ -99,7 +99,7 @@ jobs:
 ```yaml
 ---
 title: "Your awesome title"
-topics: ["GitHub Actions", "Ruby", "YAML"]
+topics: ["GitHubActions", "Ruby", "YAML"]
 published: true
 ---
 
@@ -109,7 +109,7 @@ Your article starts here.
 | キー | 説明 | 型 | 制約 |
 | --- | --- | --- | --- |
 | `title` | 記事のタイトルを指定します | 文字列 | |
-| `topics` | 記事のタグを指定します | 配列[文字列, <文字列, 文字列, ...>] | タグの数は 1 〜 5 個まで |
+| `topics` | 記事のタグを指定します | 配列[文字列, <文字列, 文字列, ...>] | • タグの数は 1 〜 5 個まで<br>• 要素内の文字列にスペースは含めるのは不可 |
 | `published` | 一般公開するか限定共有にするかを指定します | 真偽値 | |
 
 記事のファイルは `---` から始める必要があります。