reference: fix typo

tshepang · tshepang · commit a1dd2fb956ac · 2015-07-05T16:36:43.000+02:00
diff --git a/src/doc/reference.md b/src/doc/reference.md
@@ -3646,7 +3646,7 @@ Coercions are defined in [RFC401]. A coercion is implicit and has no syntax.
 ### Coercion sites
 
 A coercion can only occur at certain coercion sites in a program; these are
-typically places where the desired type is explicit or can be dervied by
+typically places where the desired type is explicit or can be derived by
 propagation from explicit types (without type inference). Possible coercion
 sites are:
 
