doc: fix typos in changelogs

I know we can't fix the parts that are commit messages, but I believe
the rest of the text is editable. Am I misremembering?

Author: Trott

doc/changelogs/CHANGELOG_V12.md

@@ -1883,7 +1883,7 @@ consumption.
 #### Increase of the default server headers timeout
 
 The default value of `server.headersTimeout` for `http` and `https` servers was
-increased from `40000` to `60000` (60 seconds). This to accomodate for systems
+increased from `40000` to `60000` (60 seconds). This to accommodate for systems
 like AWS ELB that have a timeout of 60 seconds.
 
 Contributed by Tim Costa - [#30071](https://github.com/nodejs/node/pull/30071).

doc/changelogs/CHANGELOG_V13.md

@@ -676,7 +676,7 @@ impact on Node.js 13.x users with older versions of macOS.
 
 In Node.js 13.9.0 deps/zlib was switched to the chromium maintained implementation. This change
 had the unforseen consequence of breaking building from the tarballs we release as we were too
-aggressively removing `unneccessary files` from the `deps/zlib` folder. This release includes
+aggressively removing `unnecessary files` from the `deps/zlib` folder. This release includes
 a patch that ensures that individuals will once again be able to build Node.js from source.
 
 ### Commits