Add whitespace into “Good practices for Kubernetes Secrets” (#42650)

* Update secrets-good-practices.md

changed caution as per docs 
https://kubernetes.io/docs/contribute/style/style-guide/#caution

* Update secrets-good-practices.md

added spaces as per style guide https://kubernetes.io/docs/contribute/style/style-guide/#caution

content/en/docs/concepts/security/secrets-good-practices.md

@@ -110,7 +110,7 @@ If you configure a Secret through a
 data encoded as base64, sharing this file or checking it in to a source
 repository means the secret is available to everyone who can read the manifest.
 
-{{<caution>}}
-Base64 encoding is _not_ an encryption method, it provides no additional
+{{< caution >}}
+Base64 encoding is _not_ an encryption method, it provides no additiona
 confidentiality over plain text.
-{{</caution>}}
+{{< /caution >}}