[mediaqueries-5] Avoid RFC2119 language in non-normative text

Author: frivoal

mediaqueries-5/Overview.bs

@@ -3126,19 +3126,19 @@ Detecting the desire for reduced data usage when loading a page: the 'prefers-re
 	set the <a href="https://wicg.github.io/savedata/">Save-Data</a> 
 	HTTP request header.
 
-	Note: User agents should use their own user centered discretion
+	Note: User agents are encouraged to use their own user centered discretion
 	when handling a toggle of this value,
 	whether it's toggled post page load or during page load.
 	A primary goal could be to not download unnecessary data.
 	Consider, if a page is already loaded with high quality assets
 	and the user changes their preference to reduced,
-	the page should perhaps not update the document right away,
+	the page could perhaps not update the document right away,
 	instead wait for an explicit page reload invocation from the user.
 	Consider also, if a page is taking a long time to download
 	and a user changes their preference to reduced,
 	this could be a nice point to save the user's bandwidth
 	and immediately switch to downloading smaller assets.
-	User agents should be free to implement logic
+	User agents are free to implement logic
 	as they see appropriate for situations like these,
 	and also be aware the situations exist.