Add UFSATM documentation // update MOM6 to its main repo. 20260302 commit (#3116) // Specify # of Increased Warnings/Remarks in GHA Check (#3132)

Add UFSATM documentation // update MOM6 to its main repo. 20260302 commit (#3116) // Specify # of Increased Warnings/Remarks in GHA Check (#3132) #10650