Test: minor comment tweak to trigger CI

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: sbryngelson

src/simulation/m_viscous.fpp

@@ -4,7 +4,7 @@
 #:include 'case.fpp'
 #:include 'macros.fpp'
 
-!> @brief Computes viscous stress tensors and diffusive flux contributions for the Navier--Stokes equations
+!> @brief Computes viscous stress tensors and diffusive flux contributions for Navier--Stokes equations
 module m_viscous
 
     use m_derived_types        !< Definitions of the derived types