Update diffs

Signed-off-by: Arthit Suriyawongkul <[email protected]>

Author: bact

docs/diff/README.md

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+---
+SPDX-License-Identifier: Community-Spec-1.0
+---
+
+# Differences between editions
+
+- [Differences between V3.0.1 and V3.0](./v3.0.1-v3.0.md)
+- [Differences between V3.0 and V2.3](./v3.0-v2.3.md)
+- [Differences between V2.3 and V2.2.2](./v2.3-v2.2.2.md)
+- [Differences between V2.2.2 and V2.2.1](./v2.2.2-v2.2.1.md)
+- [Differences between V2.2.1 and V2.2](./v2.2.1-v2.2.md)
+- [Differences between V2.2 and V2.1](./v2.2-v2.1.md)
+- [Differences between V2.1 and V2.0](./v2.1-v2.0.md)
+- [Differences between V2.0 and V1.2](./v2.0-v1.2.md)