Fix mappings declaration in Howto/package to correctly call 'map'

src/sphinx/Howto/package.rst

@@ -69,13 +69,13 @@ The ``artifactName`` setting controls the name of generated packages.  See the :
    :type: setting
    
    mappings in (Compile, packageBin) <+=
-      baseDirectory { dir => ( dir / "example.txt") -> "out/example.txt" }
+      baseDirectory map { dir => ( dir / "example.txt") -> "out/example.txt" }
 
 The contents of a package are defined by the ``mappings`` task, of type ``Seq[(File,String)]``.  The ``mappings`` task is a sequence of mappings from a file to include in the package to the path in the package.  See :doc:`/Detailed-Topics/Mapping-Files` for convenience functions for generating these mappings.  For example, to add the file ``in/example.txt`` to the main binary jar with the path "out/example.txt",
 
 ::
 
-    mappings in (Compile, packageBin) <+= baseDirectory { base =>
+    mappings in (Compile, packageBin) <+= baseDirectory map { base =>
        (base / "in" / "example.txt") -> "out/example.txt"
     }