Update doc/specs/stdlib_linalg.md

Co-authored-by: Jeremie Vandenplas <jeremie.vandenplas@gmail.com>

Author: perazz

doc/specs/stdlib_linalg.md

@@ -622,7 +622,7 @@ Result vector `x` returns the approximate solution that minimizes the 2-norm \(
 
 `b`: Shall be a rank-1 array containing the right-hand-side vector. It is an `intent(in)` argument.
 
-`cond` (optional): Singular value cut-off threshold for rank evaluation: `s_i >= cond*maxval(s), i=1:rank`. Shall be a scalar, `intent(in)` argument.
+`cond` (optional): Shall be a scalar `real` value cut-off threshold for rank evaluation: `s_i >= cond*maxval(s), i=1:rank`. Shall be a scalar, `intent(in)` argument.
 
 `overwrite_a` (optional): Shall be an input logical flag. if `.true.`, input matrix a will be used as temporary storage and overwritten. This avoids internal data allocation. This is an `intent(in)` argument.