fix: misspelled property in schema.json (#50)

Author: JakeAi

packages/nx/src/executors/build/schema.json

@@ -57,7 +57,7 @@
       "type": "string",
       "description": "When building, copy the package to this location."
     },
-    "prepare:": {
+    "prepare": {
       "type": "boolean",
       "description": "Starts a Webpack compilation and prepares the app's App_Resources and the plugins platforms directories. The output is generated in a subdirectory for the selected target platform in the platforms directory. This lets you build the project for the selected platform.",
       "default": false