reword changesets

Author: frangio

.changeset/strong-bulldogs-buy.md

@@ -2,4 +2,4 @@
 'openzeppelin-solidity': minor
 ---
 
-`ERC1967Upgrade`: remove the existing, contract-wide, oz-upgrades-unsafe-allow natspec.
+`ERC1967Upgrade`: removed contract-wide `oz-upgrades-unsafe-allow delegatecall` annotation, replaced by granular annotation in `UUPSUpgradeable`.

.changeset/yellow-swans-cover.md

@@ -2,4 +2,4 @@
 'openzeppelin-solidity': minor
 ---
 
-`UUPSUpgradeable`: add function specific oz-upgrades-unsafe-allow-reachable to improve check by latest version of the upgrades plugin (starting with `@openzeppelin/upgrades-core@1.21.0`).
+`UUPSUpgradeable`: added granular `oz-upgrades-unsafe-allow-reachable` annotation to improve upgrade safety checks on latest version of the Upgrades Plugins (starting with `@openzeppelin/upgrades-core@1.21.0`).