build: fix typo in build system

This fixes a typo in the build system which is important because it
fixes the dependency tracking and the output location for the swift doc
that is generated for the swift SDK overlay.

Signed-off-by: Daniel A. Steffen <dsteffen@apple.com>

Author: compnerd

cmake/modules/SwiftSupport.cmake

@@ -54,7 +54,7 @@ function(add_swift_library library)
   add_custom_command(OUTPUT
                        ${ASL_OUTPUT}
                        ${ASL_MODULE_PATH}
-                       ${moodule_directory}/${ASL_MODULE_NAME}.swiftdoc
+                       ${module_directory}/${ASL_MODULE_NAME}.swiftdoc
                      DEPENDS
                        ${ASL_SOURCES}
                      COMMAND
@@ -65,5 +65,5 @@ function(add_swift_library library)
                     DEPENDS
                        ${ASL_OUTPUT}
                        ${ASL_MODULE_PATH}
-                       ${moodule_directory}/${ASL_MODULE_NAME}.swiftdoc)
+                       ${module_directory}/${ASL_MODULE_NAME}.swiftdoc)
 endfunction()