faq: Fix minor typo

HaoZeke · web-flow · commit f54089455020 · 2021-03-13T23:00:11.000Z
diff --git a/src/faq.rst b/src/faq.rst
@@ -212,7 +212,7 @@ most common starting index is 1.
 Why does Fortran default array indexing start at 1?
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-Because that is the most commong starting index (see previous question).
+Because that is the most common starting index (see previous question).
 
 What is the motivation behind Fortran numbering convention?
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