Update template-syntax.md (#2301)

* Update template-syntax.md

* Update template-syntax.md

Author: freemedom

src/guide/essentials/template-syntax.md

@@ -14,7 +14,7 @@ The most basic form of data binding is text interpolation using the "Mustache" s
 <span>Message: {{ msg }}</span>
 ```
 
-The mustache tag will be replaced with the value of the `msg` property from the corresponding component instance. It will also be updated whenever the `msg` property changes.
+The mustache tag will be replaced with the value of the `msg` property [from the corresponding component instance](/guide/essentials/reactivity-fundamentals#declaring-reactive-state). It will also be updated whenever the `msg` property changes.
 
 ## Raw HTML {#raw-html}