JavaDoc形式の対応（Kotlin / C++ / others）

[YusukeHosonuma]

以下のような /** */ 形式をサポートする。
https://github.com/JetBrains/kotlin/blob/master/libraries/stdlib/common/src/kotlin/TextH.kt#L19-L27

    /**
     * Attempts to match a regular expression exactly at the specified [index] in the [input] char sequence.
     *
     * Unlike [matchEntire] function, it doesn't require the match to span to the end of [input].
     *
     * @return An instance of [MatchResult] if the input matches this [Regex] at the specified [index] or `null` otherwise.
     * @throws IndexOutOfBoundsException if [index] is less than zero or greater than the length of the [input] char sequence.
     * @sample samples.text.Regexps.matchAt
     */