add another example

Author: nikoladev

src/pages/index.mdx

@@ -24,6 +24,12 @@ $$
 $$
 ```
 
+Another example that doesn't work:
+
+```
+$x < 3$
+```
+
 > _(⚠️ remove the surrounding backticks to see the error)_
 
 ---
@@ -40,3 +46,7 @@ This is a workaround for the complex Katex:
 />
 
 (It also requires a slightly different input: every backslash needs to be duplicated)
+
+<KatexInline
+  formula='x < 3'
+/>