fixing typos datatype

Co-authored-by: Pano Maria <[email protected]>

Author: dachafra

spec/section/termmap.md

@@ -413,7 +413,7 @@ A <dfn>datatypeable term map</dfn> is a [=term map=] with a [=term type=] of `rm
 
 [=Datatypeable term maps=] MUST generate zero or more [=literals=]. The [=datatype=] of these [=literals=] can be automatically determined with a [=natural mapping=] (producing a [=natural RDF literal=]), or it can be explicitly specified using a [=datatype map=] (producing a [=datatype-override RDF literal=]).
 
-A <dfn>datatype map</dfn> (`rml:DatatypeMap`) is an [=term map=]. It specifies a rule for generating one or more [=datatypes=] of a [=datatypeable term map=]. A [=datatype map=] MUST generate a list of [=IRI=] values, in which the [=IRIs=] are the [=datatype IRIs=] of the [=datatypeable term map=].
+A <dfn>datatype map</dfn> (`rml:DatatypeMap`) is a [=term map=]. It specifies a rule for generating one or more [=datatypes=] for a [=datatypeable term map=]. A [=datatype map=] MUST generate a list of [=IRI=] values, in which the [=IRIs=] are the [=datatype IRIs=] of the [=datatypeable term map=].
 
 Given the list of values resulting from a [=datatypeable term map=] `T`, and the list of values resulting from its [=datatype map=] `D`, the resulting terms are generated by the [=n-ary Cartesian product=] combination of `T × D`, where the values in `T` are the [=literal=] values, and the values in `D` are the [=datatype IRIs=].