Minor README update

Author: kasaurov

amd/comgr/README.md

@@ -109,6 +109,7 @@ HTML for investigation:
     $ make -j
     $ make test test-lit
     $ cd profiles
+    # 1. Manually aggregate the data and create text report.
     $ $LLVM_PROJECT/bin/llvm-profdata merge -sparse *.profraw -o \
         comgr_test.profdata # merge and index data
     $ $LLVM_PROJECT/bin/llvm-cov report ../libamd_comgr.so \
@@ -117,6 +118,8 @@ HTML for investigation:
         -instr-profile=comgr_test.profdata \
         -ignore-filename-regex="[cl].*/include/*" # show test report without \
         includes
+    # 2. Use Perl script to aggregate the data and create html report.
+    # The manual steps in 1. above are not needed in this case.
     $ $LLVM_PROJECT/../llvm/utils/prepare-code-coverage-artifact.py \
         --preserve-profiles $LLVM_PROJECT/bin/llvm-profdata \
         $LLVM_PROJECT/bin/llvm-cov . html ../libamd_comgr.so \