Update specification/resource/semantic_conventions/browser.md

Co-authored-by: Armin Ruech <armin.ruech@dynatrace.com>

specification/resource/semantic_conventions/browser.md

@@ -20,5 +20,5 @@ All of these attributes can be provided by the user agent itself in the form of
 **[2]:** This value is intended to be taken from the [UA client hints API](https://wicg.github.io/ua-client-hints/#interface) (navigator.userAgentData.platform).
 If unavailable, the legacy `navigator.platform` API SHOULD NOT be used instead and this attribute SHOULD be left unset in order for the values to be consistent .
 
-**[3]:** The user-agent value should be provided only from browsers that do not have a mechanism to retrieve brands and platform individually from the User-Agent Client Hints API. To retrieve the value, the legacy `navigator.userAgent` API can be used.
+**[3]:** The user-agent value SHOULD be provided only from browsers that do not have a mechanism to retrieve brands and platform individually from the User-Agent Client Hints API. To retrieve the value, the legacy `navigator.userAgent` API can be used.
 <!-- endsemconv -->