Update doc/specs/stdlib_quadrature.md

Co-authored-by: Sebastian Ehlert <28669218+awvwgk@users.noreply.github.com>

Author: hsnyder

doc/specs/stdlib_quadrature.md

@@ -247,7 +247,7 @@ Accuracy has been validated up to N=64 by comparing computed results to tablulat
 
 ### Syntax
 
-`subroutine [[stdlib_quadrature(module):gauss_legendre_lobatto(interface)]](x, w [, interval])`
+`subroutine [[stdlib_quadrature(module):gauss_legendre_lobatto(interface)]] (x, w[, interval])`
 
 ### Arguments
 
@@ -268,4 +268,3 @@ real(dp), dimension(N) :: x,w
 call gauss_legendre_lobatto(x,w)
 integral = sum(x**2 * w)
 ```
-