fix: remove 's'

iw4x/iw4x_00/common_scripts/utility.gsc

@@ -3851,7 +3851,7 @@ create_dvar( var, val )
 =============
 ///ScriptDocBegin
 "Name: setPing()"
-"Summary: Does nothing. Added for backwards compatibility"
+"Summary: Does nothing. Added for backward compatibility"
 "Module: Utility"
 "Example: self setPing( 100 );"
 "SPMP: multiplayer"
@@ -3866,7 +3866,7 @@ setPing()
 =============
 ///ScriptDocBegin
 "Name: getPing()"
-"Summary: Returns a fixed number. Added for backwards compatibility"
+"Summary: Returns a fixed number. Added for backward compatibility"
 "Module: Utility"
 "Example: self getPing();"
 "SPMP: multiplayer"