Correcting span sampling language

Author: codyde

docs/platforms/javascript/common/tracing/configure-sampling/index.mdx

@@ -126,7 +126,8 @@ When multiple sampling mechanisms could apply, Sentry follows this order of prec
 - If `tracesSampler` is defined, its decision is used. Although the `tracesSampler` can override the parent sampling decision, most users will want to ensure their `tracesSampler` respects the parent sampling decision. 
 - If no `tracesSampler` is defined, but there is a parent sampling decision from an incoming distributed trace, we use the parent sampling decision
 - If neither of the above, `tracesSampleRate` is used
-- If none of the above are set, no transactions are sampled. This is equivalent to setting `tracesSampleRate` to `0.0`.
+- If `tracesSampleRate` is set to 0, no spans will be sampled, and no downstream spans will be sampled either since they inherit the parent sampling decision
+- If none of the above are set, no transactions are sampled and tracing will be disabled
 
 ## Conclusion