invalid `BeginDocumentationCommentWithOneLineSummary` warning

[rauhul]

  /// Open a scope enclosed by `"typewriter"` double-quotes.
  ///
  /// Closed by a ``EndTypewriterDoubleQuotes`` macro.
  ///
  /// __Example Usage__:
  ///   ```swift
  ///   BeginTypewriterDoubleQuotes()
  ///   "Hello, Swift!"
  ///   EndTypewriterDoubleQuotes()
  ///   ```
  public struct BeginTypewriterDoubleQuotes: MDocMacroProtocol {
    public static let kind = "Qo"
    public var arguments: [MDocASTNode]
    /// Creates a new `BeginTypewriterDoubleQuotes` macro.
    public init() {
      self.arguments = []
    }
  }

triggers: Tools/generate-manual/MDoc/MDocMacro.swift:1144:3: warning: [BeginDocumentationCommentWithOneLineSummary] terminate this sentence with a period: "Open a scope enclosed by "typewriter" double-quotes."

[ahoppen]

Synced to Apple’s issue tracker as rdar://144429143