update upgrade guide

GoogleCloudPlatform · Mar 5, 2024 · 531c5ca · 531c5ca
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diff --git a/docs/upgrading_to_v2.1.md b/docs/upgrading_to_v2.1.md
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 # Upgrading to v2.1.0
 
-The v2.1 release contains backwards-compatible. `preconfigured_waf_config_exclusion` is obsolete and will be removed in next major version.
+The v2.1 release is backwards-compatible but `preconfigured_waf_config_exclusion` in `pre_configured_rules` and `custom_rules`is obsolete and will be removed in next major version release.
 
 ## Preconfigured WAF Config
 :bangbang: **NOTE:** `preconfigured_waf_config_exclusion` in `pre_configured_rules` and `custom_rules` is obsolete and available for backward compatibility only. Use `preconfigured_waf_config_exclusions` which allows multiple exclusions. They are mutually exclusive.