src: fix typos

PR-URL: https://github.com/nodejs/node/pull/55064
Reviewed-By: Filip Skokan <panva.ip@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>

src/cppgc_helpers.h

@@ -121,7 +121,7 @@ class CppgcMixin : public cppgc::GarbageCollectedMixin {
 
 /**
  * Helper macro the manage the cppgc-based wrapper hierarchy. This must
- * be used at the left-most postion - right after `:` in the class inheritance,
+ * be used at the left-most position - right after `:` in the class inheritance,
  * like this:
  * class Klass : CPPGC_MIXIN(Klass) ... {}
  *