Update lib/matplotlib/backends/backend_pdf.py

Co-authored-by: Elliott Sales de Andrade <[email protected]>

Author: scottjones03

lib/matplotlib/backends/backend_pdf.py

@@ -2759,7 +2759,7 @@ def print_pdf(self, filename, *,
                   bbox_inches_restore=None, metadata=None):
 
         dpi = self.figure.dpi
-        self.figure.dpi = 72            # there are 72 pdf points to an inch
+        self.figure.dpi = 72  # there are 72 pdf points to an inch
         width, height = self.figure.get_size_inches()
         if isinstance(filename, PdfPages):
             file = filename._file