changelog: Removes brackets from not-links (anza-xyz#4765)

CHANGELOG.md

@@ -13,7 +13,7 @@ Release channels have their own copy of this changelog:
 * [stable - v2.0](https://github.com/anza-xyz/agave/blob/v2.0/CHANGELOG.md)
 
 <a name="edge-channel"></a>
-## [2.2.0] - Unreleased
+## 2.2.0 - Unreleased
 * Breaking:
   * Blockstore Index column format change
     * The Blockstore Index column format has been updated. The column format written in v2.2 is compatible with v2.1, but incompatible with v2.0 and older.
@@ -29,7 +29,7 @@ Release channels have their own copy of this changelog:
   * SDK:
     * `cargo-build-sbf`: add `--skip-tools-install` flag to avoid downloading platform tools and `--no-rustup-override` flag to not use rustup when invoking `cargo`. Useful for immutable environments like Nix.
 
-## [2.1.0]
+## 2.1.0
 * Breaking:
   * SDK:
     * `cargo-build-bpf` and `cargo-test-bpf` have been deprecated for two years and have now been definitely removed.
@@ -75,7 +75,7 @@ solana_pubkey::declare_id!("MyProgram1111111111111111111111111111111111");
   * `unified-scheduler` as default option for `--block-verification-method` (#2653)
   * warn that `thread-local-multi-iterator` option for `--block-production-method` is deprecated (#3113)
 
-## [2.0.0]
+## 2.0.0
 * Breaking
   * SDK:
     * Support for Borsh v0.9 removed, please use v1 or v0.10 (#1440)
@@ -116,7 +116,7 @@ solana_pubkey::declare_id!("MyProgram1111111111111111111111111111111111");
   * Deprecate the `fifo` option for `--rocksdb-shred-compaction` (#1882)
     * `fifo` will remain supported in v2.0 with plans to fully remove in v2.1
 
-## [1.18.0]
+## 1.18.0
 * Changes
   * Added a github check to support `changelog` label
   * The default for `--use-snapshot-archives-at-startup` is now `when-newest` (#33883)
@@ -143,7 +143,7 @@ limited backward compatibility for v0.10 and v0.9. Please upgrade to Borsh v1.
   * Operators running their own bigtable instances need to create the `entries`
     table before upgrading their warehouse nodes
 
-## [1.17.0]
+## 1.17.0
 * Changes
   * Added a changelog.
   * Added `--use-snapshot-archives-at-startup` for faster validator restarts