Clarify xref to fmt spec
@@ -395,7 +395,7 @@ Most of them return a string, however some of these functions actually return an
.Ql %spec
pattern replaced by interpolating the format
.Ar spec
-.Pq c.f. Sx Symbol interpolation
+.Pq using the same syntax as Sx Symbol interpolation
with its corresponding argument in
.Ar args
.Pq So %% Sc is replaced by the So % Sc character .
