doc: remove "note that" from using-symbols.md

Refs: nodejs/remark-preset-lint-node#16

PR-URL: #28329
Reviewed-By: Gus Caplan <me@gus.host>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

Author: Trott

doc/guides/using-symbols.md

@@ -14,7 +14,6 @@ https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Symbo
 ## `Symbol(string)`
 
 Symbols created via `Symbol(string)` are local to the caller function.
-Note that `Symbol('hello') !== Symbol('hello')`.
 For this reason, we often use them to simulate private fields, like so:
 
 ```js
@@ -31,8 +30,7 @@ class MyObject {
 module.exports.MyObject = MyObject;
 ```
 
-Note that Symbols are not _fully private_, as the data could be accessed
-anyway:
+Symbols are not fully private, as the data could be accessed anyway:
 
 ```js
 for (const s of Object.getOwnPropertySymbols(obj)) {