Use raw doc string to fix SyntaxWarning

Author: remlapmot

nbs/09_magics.ipynb

@@ -1100,7 +1100,7 @@
     "#| export\n",
     "@patch_to(StataMagics)\n",
     "def magic_help(self, code, kernel, cell):\n",
-    "    \"\"\"Show help file from stata.com/help.cgi?\\{\\}\"\"\"\n",
+    "    r\"\"\"Show help file from stata.com/help.cgi?{}\"\"\"\n",
     "    try:\n",
     "        html_help = self._get_help_html(code)\n",
     "    except Exception as e: # original: (urllib.error.HTTPError, urllib.error.URLError)\n",

nbstata/magics.py

@@ -428,7 +428,7 @@ def _get_help_html(self, code):
 # %% ../nbs/09_magics.ipynb 56
 @patch_to(StataMagics)
 def magic_help(self, code, kernel, cell):
-    """Show help file from stata.com/help.cgi?\{\}"""
+    r"""Show help file from stata.com/help.cgi?{}"""
     try:
         html_help = self._get_help_html(code)
     except Exception as e: # original: (urllib.error.HTTPError, urllib.error.URLError)