Minor typo fixes in NEWS.md.

Author: YvanFournier

NEWS.md

@@ -45,7 +45,7 @@ Release 9.0.0 (unreleased)
 ### Numerics:
 
 - Compute boundary value reconstruction ahead of calls to lower-level operators
-  such as gradiants and balances.
+  such as gradients and balances.
   * This leads to removal of the `CS_GRADIENT_LSQ_BOUNDARY` environment variable,
     wich allowed switching to an older algorithm for least-squares vector
     and tensor gradients.
@@ -99,8 +99,8 @@ Release 8.3.0 (2024-12-20)
   mainly for postprocessing, but will be extened in v9.0.
 
 - Conjugate Heat Transfer can now be conducted with the CDO based Heat transfer
-  solver of code_saturne. This is handled in the same manner as a syrthes coupling
-  in the GUI for the user.
+  solver of code_saturne. This is handled in the same manner as a Syrthes
+  coupling in the GUI for the user.
 
 - Rename all cs_user_XXX.c functions to cs_user_XXX.cpp thus allowing calls
   to C++ functions within these functions.