cherry pick #3036 to release-1.1 (#3040)

Signed-off-by: ti-srebot <ti-srebot@pingcap.com> Co-authored-by: DanielZhangQD <36026334+DanielZhangQD@users.noreply.github.com>
pingcap · Jul 30, 2020 · e062366 · e062366
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diff --git a/docs/api-references/docs.md b/docs/api-references/docs.md
@@ -3680,7 +3680,8 @@ bool
 <td>
 <em>(Optional)</em>
 <p>Whether enable the syntax like <code>auto_random(3)</code> on the primary key column.
-imported from TiDB v3.1.0</p>
+Imported from TiDB v3.1.0.
+Deprecated in TiDB v4.0.3, please check detail in <a href="https://docs.pingcap.com/tidb/dev/release-4.0.3#improvements">https://docs.pingcap.com/tidb/dev/release-4.0.3#improvements</a>.</p>
 </td>
 </tr>
 <tr>

diff --git a/pkg/apis/pingcap/v1alpha1/openapi_generated.go b/pkg/apis/pingcap/v1alpha1/openapi_generated.go
diff --git a/pkg/apis/pingcap/v1alpha1/tidb_config.go b/pkg/apis/pingcap/v1alpha1/tidb_config.go
@@ -530,7 +530,8 @@ type IsolationRead struct {
 // +k8s:openapi-gen=true
 type Experimental struct {
 	// Whether enable the syntax like `auto_random(3)` on the primary key column.
-	// imported from TiDB v3.1.0
+	// Imported from TiDB v3.1.0.
+	// Deprecated in TiDB v4.0.3, please check detail in https://docs.pingcap.com/tidb/dev/release-4.0.3#improvements.
 	// +optional
 	AllowAutoRandom *bool `toml:"allow-auto-random,omitempty" json:"allow-auto-random,omitempty"`
 	// Whether enable creating expression index.