docs: make `Table of contents` as bold
diff --git a/docs/exception-handling.md b/docs/exception-handling.md
index 2d5d589..30ae615 100644
--- a/docs/exception-handling.md
+++ b/docs/exception-handling.md
@@ -15,7 +15,7 @@
 
 class ExceptionsGuideTest {
 --> 
-## Table of contents
+**Table of contents**
 
 <!--- TOC -->