fix docs

Author: 9il

source/mir/math/stat.d

@@ -98,6 +98,8 @@ Computes the average of `r`, which must be a finite iterable.
 
 Returns:
     The average of all the elements in the range r.
+
+See_also: $(SUBREF sum, Summation)
 +/
 template mean(F, Summation summation = Summation.appropriate)
 {
@@ -301,7 +303,7 @@ version(mir_test)
 /++
 Computes the harmonic mean of a range.
 
-See_also: $(SUBREF sum, sum)
+See_also: $(SUBREF sum, Summation)
 +/
 template hmean(F, Summation summation = Summation.appropriate)
 {

source/mir/math/sum.d

@@ -1636,7 +1636,7 @@ value, but its type will be used if it is not specified.
 
 Note that these specialized summing algorithms execute more primitive operations
 than vanilla summation. Therefore, if in certain cases maximum speed is required
-at expense of precision, one can use $(LREF, Summation.fast).
+at expense of precision, one can use $(LREF Summation.fast).
 
 Returns:
     The sum of all the elements in the range r.

source/mir/ndslice/concatenation.d

@@ -79,7 +79,7 @@ private template _Expose(size_t maxN, size_t dim)
 /++
 Creates a $(LREF Concatenation) view of multiple slices.
 
-Can be used in combination with itself, $(LREF until), $(SUBREF, allocation, slice),
+Can be used in combination with itself, $(LREF until), $(SUBREF allocation, slice),
 and $(SUBREF slice, Slice) assignment.
 
 Params:

source/mir/ndslice/topology.d

@@ -3125,7 +3125,7 @@ Params:
 Returns:
     n-dimensional slice with the same kind, shape and strides.
 
-See_also: `indexed` is similar to $(LREF, vmap), but a field (`[]`) is used instead of a function (`()`), and order of arguments is reversed.
+See_also: `indexed` is similar to $(LREF vmap), but a field (`[]`) is used instead of a function (`()`), and order of arguments is reversed.
 +/
 Slice!(IndexIterator!(Iterator, Field), N, kind)
     indexed(Field, Iterator, size_t N, SliceKind kind)