Merge pull request #387 from C-Mejlak/christian/escape-curly-braces

chore: escape curly braces so MDX does not treat them as an expression

Author: hslatman

step-cli/reference/ca/token/README.mdx

@@ -315,7 +315,7 @@ $ step ca token --kms yubikey:pin-value=123456 \
 ```
 
 Generate a token with custom data in the "user" claim. The example below can be
-accessed in a template as **{{ .Token.user.field }}**, rendering to the string
+accessed in a template as **\{\{ .Token.user.field }}**, rendering to the string
 "value".
 
 This is distinct from **.Insecure.User**: any attributes set using this option