doc: edit maxBuffer/Unicode paragraph for clarity

Remove unneeded words from child_process doc.

PR-URL: https://github.com/nodejs/node/pull/11228
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

doc/api/child_process.md

@@ -1157,16 +1157,11 @@ to the same value.
 
 ## `maxBuffer` and Unicode
 
-It is important to keep in mind that the `maxBuffer` option specifies the
-largest number of *octets* allowed on `stdout` or `stderr`. If this value is
-exceeded, then the child process is terminated. This particularly impacts
-output that includes multibyte character encodings such as UTF-8 or UTF-16.
-For instance, the following will output 13 UTF-8 encoded octets to `stdout`
-although there are only 4 characters:
-
-```js
-console.log('中文测试');
-```
+The `maxBuffer` option specifies the largest number of bytes allowed on `stdout`
+or `stderr`. If this value is exceeded, then the child process is terminated.
+This impacts output that includes multibyte character encodings such as UTF-8 or
+UTF-16. For instance, `console.log('中文测试')` will send 13 UTF-8 encoded bytes
+to `stdout` although there are only 4 characters.
 
 [`'error'`]: #child_process_event_error
 [`'exit'`]: #child_process_event_exit