Merge pull request #2766 from cedretaber/fix-a-typo

[Docs] Fix a typo

Author: bobzhang

site/docsource/FAQ.adoc

@@ -74,5 +74,5 @@ The issue here isn't that the function is polymorphic. You can use (and probably
 
 [source]
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-lat _ = map (fun v -> id v [@bs])
+let _ = map (fun v -> id v [@bs])
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