[gardening] improve markdown formatting in documentation comments

Author: WowbaggersLiquidLunch

Sources/PackageDescription/Version+StringLiteralConvertible.swift

@@ -9,11 +9,8 @@
 */
 
 extension Version: ExpressibleByStringLiteral {
-
     /// Initializes a version struct with the provided string literal.
-    ///
-    /// - Parameters:
-    ///     - version: A string literal to use for creating a new version struct.
+    /// - Parameter version: A string literal to use for creating a new version struct.
     public init(stringLiteral value: String) {
         if let version = Version(value) {
             self = version

Sources/PackageDescription/Version.swift

@@ -55,11 +55,11 @@ public struct Version {
     /// Initializes a version struct with the provided components of a semantic version.
     ///
     /// - Parameters:
-    ///     - major: The major version number.
-    ///     - minor: The minor version number.
-    ///     - patch: The patch version number.
-    ///     - prereleaseIdentifiers: The pre-release identifier.
-    ///     - buildMetaDataIdentifiers: Build metadata that identifies a build.
+    ///   - major: The major version number.
+    ///   - minor: The minor version number.
+    ///   - patch: The patch version number.
+    ///   - prereleaseIdentifiers: The pre-release identifier.
+    ///   - buildMetaDataIdentifiers: Build metadata that identifies a build.
     public init(
         _ major: Int,
         _ minor: Int,