doc: remove markdown link from heading

This is the only instance of such a link and it is rendered
incorrectly in the TOC.
PR-URL: #47585
Reviewed-By: Rafael Gonzaga <rafael.nunu@hotmail.com>
Reviewed-By: Darshan Sen <raisinten@gmail.com>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>

Author: tniessen

doc/api/permissions.md

@@ -388,7 +388,7 @@ The following example, would allow access to `fs` for all `data:` resources:
 }
 ```
 
-##### Example: [import maps][] emulation
+##### Example: import maps emulation
 
 Given an import map:
 
@@ -425,7 +425,7 @@ Given an import map:
 }
 ```
 
-Import maps assume you can get any resource by default. This means
+[Import maps][] assume you can get any resource by default. This means
 `"dependencies"` at the top level of the policy should be set to `true`.
 Policies require this to be opt-in since it enables all resources of the
 application cross linkage which doesn't make sense for many scenarios. They also
@@ -547,13 +547,13 @@ There are constraints you need to know before using this system:
  write access.
 * Permission changes are not retroactively applied to existing resources.
 
+[Import maps]: https://url.spec.whatwg.org/#relative-url-with-fragment-string
 [Security Policy]: https://github.com/nodejs/node/blob/main/SECURITY.md
 [`--allow-child-process`]: cli.md#--allow-child-process
 [`--allow-fs-read`]: cli.md#--allow-fs-read
 [`--allow-fs-write`]: cli.md#--allow-fs-write
 [`--allow-worker`]: cli.md#--allow-worker
 [`--experimental-permission`]: cli.md#--experimental-permission
 [`permission.has()`]: process.md#processpermissionhasscope-reference
-[import maps]: https://url.spec.whatwg.org/#relative-url-with-fragment-string
 [relative-url string]: https://url.spec.whatwg.org/#relative-url-with-fragment-string
 [special schemes]: https://url.spec.whatwg.org/#special-scheme