chore: minor fixes to srxconfutils_app.py and cookiecutter.json

Author: zmx27

cookiecutter.json

@@ -2,7 +2,7 @@
   "maintainer_name": "Simon J.L. Billinge group",
   "maintainer_email": "sb2896@columbia.edu",
   "maintainer_github_username": "sbillinge",
-  "contributors": "Billinge Group members",
+  "contributors": "Xiaohao Yang and Billinge Group members",
   "license_holders": "The Trustees of Columbia University in the City of New York",
   "project_name": "diffpy.srxconfutils",
   "github_username_or_orgname": "diffpy",

src/diffpy/srxconfutils/srxconfutils_app.py

@@ -7,7 +7,7 @@ def main():
     parser = argparse.ArgumentParser(
         prog="diffpy.srxconfutils",
         description=(
-            "Configuration utilities for dpx project. Part of xPDFsuite\n\n"
+            "Configuration utilities for project. Part of xPDFsuite\n"
             "For more information, visit: "
             "https://github.com/diffpy/diffpy.srxconfutils/"
         ),