[linalg.syn] Fix return type of the dot function

Author: jensmaurer

source/numerics.tex

@@ -10642,10 +10642,10 @@
 
   // \ref{linalg.algs.blas1.dot}, dot product of two vectors
   template<@\exposconcept{in-vector}@ InVec1, @\exposconcept{in-vector}@ InVec2, class Scalar>
-    T dot(InVec1 v1, InVec2 v2, Scalar init);
+    Scalar dot(InVec1 v1, InVec2 v2, Scalar init);
   template<class ExecutionPolicy, @\exposconcept{in-vector}@ InVec1, @\exposconcept{in-vector}@ InVec2, class Scalar>
-    T dot(ExecutionPolicy&& exec,
-          InVec1 v1, InVec2 v2, Scalar init);
+    Scalar dot(ExecutionPolicy&& exec,
+               InVec1 v1, InVec2 v2, Scalar init);
   template<@\exposconcept{in-vector}@ InVec1, @\exposconcept{in-vector}@ InVec2>
     auto dot(InVec1 v1, InVec2 v2);
   template<class ExecutionPolicy, @\exposconcept{in-vector}@ InVec1, @\exposconcept{in-vector}@ InVec2>