Use double quotes

Author: goanpeca

content/en/user-survey-2020.md

@@ -11,8 +11,8 @@ map out a landscape of the NumPy community and voiced their thoughts about the
 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"'
+    src="/surveys/NumPy_usersurvey_2020_report_cover.png"
+    alt="Cover page of the 2020 NumPy user survey report, titled 'NumPy Community Survey 2020 - results'"
     width='250' >}}
 {{< /figure >}}