Remove docs on schema aware composition validation

Not relevant to functions. There's still some validation but it's common
sense unconfigrable CEL stuff - not worth documenting.

Signed-off-by: Nic Cope <nicc@rk0n.org>

content/v2.0-preview/composition/compositions.md

@@ -467,106 +467,6 @@ composite`.
 Composition.
 {{< /hint >}}
 
-## Composition validation
-
-When creating a Composition, Crossplane automatically validates its integrity,
-checking that the Composition is well formed, for example:
-
-If using `mode: Resources`:
-
-* The `resources` field isn't empty.
-* All resources either use a `name` or don't. Compositions can't use both named
-  and unnamed resources.
-* No duplicate resource names.
-* Patch sets must have names.
-* Patches that require a `fromFieldPath` value provide it.
-* Patches that require a `toFieldPath` value provide it.
-* Patches that require a `combine` field provide it.
-* Readiness checks using `matchString` aren't empty.
-* Readiness checks using `matchInteger` isn't `0`.
-* Readiness checks requiring a `fieldPath` value provide it.
-
-If using `mode: Pipeline` (Composition Functions):
-
-* The `pipeline` field isn't empty.
-* No duplicate step names.
-
-### Composition schema aware validation
-
-Crossplane also performs schema aware
-validation of Compositions. Schema validation checks that `patches`,
-`readinessChecks` and `connectionDetails` are valid according to the resource
-schemas. For example, checking that the source and destination fields of a patch
-are valid according to the source and destination resource schema.
-
-{{<hint "note" >}}
-Composition schema aware validation is a beta feature. Crossplane enables
-beta features by default.
-
-Disable schema aware validation by setting the
-`--enable-composition-webhook-schema-validation=false` flag on the Crossplane
-pod.
-
-The [Crossplane Pods]({{<ref "../guides/pods#edit-the-deployment">}}) page has
-more information on enabling Crossplane flags.
-{{< /hint >}}
-
-#### Schema aware validation modes
-
-Crossplane always rejects Compositions in case of integrity errors.
-
-Set the schema aware validation mode to configure how Crossplane handles both
-missing resource schemas and schema aware validation errors.
-
-{{<hint "note" >}}
-If a resource schema is missing, Crossplane skips schema aware validation
-but still returns an error for integrity errors and a warning or an error
-for the missing schemas.
-{{< /hint >}}
-
-The following modes are available:
-
-{{< table "table table-sm table-striped" >}}
-| Mode     | Missing Schema | Schema Aware Error | Integrity Error |
-| -------- | -------------- |--------------------|-----------------|
-| `warn`   | Warning        | Warning            | Error           |
-| `loose`  | Warning        | Error              | Error           |
-| `strict` | Error          | Error              | Error           |
-{{< /table >}}
-
-Change the validation mode for a Composition with the
-{{<hover label="mode" line="5">}}crossplane.io/composition-schema-aware-validation-mode{{</hover>}}
-annotation.
-
-If not specified, the default mode is `warn`.
-
-For example, to enable `loose` mode checking set the annotation value to
-{{<hover label="mode" line="5">}}loose{{</hover>}}.
-
-```yaml {copy-lines="none",label="mode"}
-apiVersion: apiextensions.crossplane.io/v1
-kind: Composition
-metadata:
-  annotations:
-    crossplane.io/composition-schema-aware-validation-mode: loose
-  # Removed for brevity
-spec:
-  # Removed for brevity
-```
-
-{{<hint "important" >}}
-Validation modes also apply to Compositions defined by Configuration packages.
-
-Depending on the mode configured in the Composition, schema aware validation
-issues may result in warnings or the rejection of the Composition.
-
-View the Crossplane logs for validation warnings.
-
-Crossplane sets a Configuration as unhealthy if there are validation errors.
-View the Configuration details with `kubectl describe configuration` to see the
-specific errors.
-{{< /hint >}}
-
 ## Write a composition function
 
 Composition functions let you replace complicated Compositions with code written