disable rocrv2, properly

hipamd/docs/markdown/hip_porting_guide.md

@@ -290,7 +290,7 @@ hipcc adds the necessary libraries for HIP as well as for the accelerator compil
 
 ### -lm Option
  
-hcc does not add “-lm” by default. If you see errors about missing math functions at link time (e.g., "sqrt@@GLIBC_2.2.5"), ensure that “-lm” is in the link options.
+hipcc adds -lm by default to the link command.
 
 
 ## Linking Code With Other Compilers