updating master content and removing content from v1.16

Signed-off-by: Mehmet Enes <[email protected]>

Author: enesonus

content/master/cli/command-reference.md

@@ -829,7 +829,8 @@ Configuration/platform-ref-aws                             v0.9.0    True
 The `crossplane beta validate` command validates 
 [compositions]({{<ref "../concepts/compositions">}}) against provider or XRD 
 schemas using the Kubernetes API server's validation library
-with additional validation checks such as Unknown Field Check.
+with additional validation such as checking for unknown fields,
+a common source of difficult to debug issues in Crossplane.
 
 The `crossplane beta validate` command supports validating the following 
 scenarios:

content/v1.16/cli/command-reference.md

@@ -828,8 +828,7 @@ Configuration/platform-ref-aws                             v0.9.0    True
 
 The `crossplane beta validate` command validates 
 [compositions]({{<ref "../concepts/compositions">}}) against provider or XRD 
-schemas using the Kubernetes API server's validation library 
-with additional validation checks such as Unknown Field Check.
+schemas using the Kubernetes API server's validation library.
 
 The `crossplane beta validate` command supports validating the following 
 scenarios: