Update substitutions.md (#429)

Co-authored-by: Martijn Laarman <[email protected]>
elastic · Feb 6, 2025 · 4c6aab9 · 4c6aab9
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diff --git a/docs/syntax/substitutions.md b/docs/syntax/substitutions.md
@@ -24,6 +24,8 @@ subs:
 If a substitution is defined globally it may not be redefined (shaded) in a files `frontmatter`. 
 Doing so will result in a build error.
 
+To use the variables in your files, surround them in curly brackets (`{{variable}}`).
+
 ## Example
 
 Here are some variable substitutions: