Fix typo

Co-authored-by: Mateusz Jakub Fila <[email protected]>

doc/links.md

@@ -48,7 +48,7 @@ see [the implementation details](#implementation-details).
 Using `Link`s is quite simple. The most straight forward way is to simply
 declare them as part of the datamodel, [as described
 here](datamodel_syntax.md#definition-of-links). That will result in code
-generation that effectiely does what is described here. However, it's not
+generation that effectively does what is described here. However, it's not
 strictly necessary to do that in case non-generated code is preferred. In line
 with other datatypes that are generated by podio all the functionality can be
 gained by including the corresponding `Collection` header. After that it is