Update a comment about make verbose option, dropping Q= explanation.

According to the <https://bugs.ruby-lang.org/issues/18756>, the `Q=` is not
recommended. The `V=1` is recommended to output for the verbose mode.
The `make V=1` suppresses some logs that `make` without `V=1` outputs rather
than just adding verbose logs.

While the `V=1 ECHO0=echo` is more equivalent with `Q=`, the
`make V=1 ECHO0=echo` doesn't really output meaningful logs additionally.
So, the `make V=1` is the best option for us to check the compiler flags.

ruby.spec

@@ -670,8 +670,8 @@ autoconf
         --with-ruby-version='' \
         --enable-multiarch \
 
-# Q= makes the build output more verbose and allows to check Fedora
-# compiler options.
+# V=1 in %%make_build outputs the compiler options more verbosely.
+# https://bugs.ruby-lang.org/issues/18756
 %make_build COPY="cp -p"
 
 %install