array_group -> list_to_matrix fixes

linalg.scad

@@ -321,7 +321,7 @@ function submatrix_set(M,A,m=0,n=0) =
 // Description:
 //   Constructs a matrix by horizontally "stacking" together compatible matrices or vectors.  Vectors are treated as columsn in the stack.
 //   This command is the inverse of `column`.  Note: strings given in vectors are broken apart into lists of characters.  Strings given
-//   in matrices are preserved as strings.  If you need to combine vectors of strings use array_group as shown below to convert the
+//   in matrices are preserved as strings.  If you need to combine vectors of strings use {{list_to_matrix}} as shown below to convert the
 //   vector into a column matrix.  Also note that vertical stacking can be done directly with concat.  
 // Arguments:
 //   M1 = If given with other arguments, the first matrix (or vector) to stack.  If given alone, a list of matrices/vectors to stack. 
@@ -344,7 +344,7 @@ function submatrix_set(M,A,m=0,n=0) =
 //   strmat = [["three","four"], ["five","six"]];
 //   e = hstack(strvec,strvec); // Returns [["o", "n", "e", "o", "n", "e"],
 //                              //          ["t", "w", "o", "t", "w", "o"]]
-//   f = hstack(array_group(strvec,1), array_group(strvec,1));
+//   f = hstack(list_to_matrix(strvec,1), list_to_matrix(strvec,1));
 //                              // Returns [["one", "one"],
 //                              //          ["two", "two"]]
 //   g = hstack(strmat,strmat); //  Returns: [["three", "four", "three", "four"],