doc: add more details for localStorage and sessionStorage

doc/api/cli.md

@@ -1553,7 +1553,7 @@ added: v22.4.0
 
 The file used to store `localStorage` data. If the file does not exist, it is
 created the first time `localStorage` is accessed. The same file may be shared
-between multiple Node.js processes concurrently. This flag is a no-op unless
+between multiple Node.js processes simultaneously. This flag is a no-op unless
 Node.js is started with the `--experimental-webstorage` flag.
 
 ### `--max-http-header-size=size`

doc/api/globals.md

@@ -592,6 +592,7 @@ added: v22.4.0
 
 A browser-compatible implementation of [`localStorage`][]. Data is stored
 unencrypted in the file specified by the [`--localstorage-file`][] CLI flag.
+The maximum amount of data that can be stored is 10MB.
 Any modification of this data outside of the Web Storage API is not supported.
 Enable this API with the [`--experimental-webstorage`][] CLI flag.
 
@@ -972,8 +973,8 @@ added: v22.4.0
 > Stability: 1.0 - Early development.
 
 A browser-compatible implementation of [`sessionStorage`][]. Data is stored in
-memory, with a storage quota of 10 MB. Any modification of this data outside of
-the Web Storage API is not supported. Enable this API with the
+memory, with a storage quota of 10 MB. `sessionStorage` data persists only within
+the currently running process, and is not shared between workers.
 [`--experimental-webstorage`][] CLI flag.
 
 ## `setImmediate(callback[, ...args])`