Fix user survey image

Author: melissawm

content/en/user-survey-2020.md

@@ -12,7 +12,8 @@ future of the project.
 
 {{< figure
     src="/surveys/NumPy_usersurvey_2020_report_cover.png"
-    alt="Cover page of the 2020 NumPy user survey report, titled 'NumPy Community Survey 2020 - results'"
+    alt="Cover page of the 2020 NumPy user survey report"
+    title="NumPy Community Survey 2020 - results"
     width=250
 >}}