Update guide.md
Fix typo from .html to .md to generate correct link. It is also possible to use the link
Closes
@@ -1075,5 +1075,5 @@ these messages.
## Troubleshooting performance by profiling
-See the [Performance Profiling](performance.html#performance-profiling) section.
+See the [Performance Profiling](skylark/performance.md#performance-profiling) section.
