doc: fix nits in esm.md

* Fix some abbreviated wording, a typo and a link.
* Wrap long lines at 80 characters.

PR-URL: nodejs#15315
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: James M Snell <jasnell@gmail.com>

doc/api/esm.md

@@ -6,17 +6,21 @@
 
 <!--name=esm-->
 
-Node contains support for ES Modules based upon the [the Node EP for ES Modules][].
+Node.js contains support for ES Modules based upon the
+[Node.js EP for ES Modules][].
 
-Not all features of the EP are complete and will be landing as both VM support and implementation is ready. Error messages are still being polished.
+Not all features of the EP are complete and will be landing as both VM support
+and implementation is ready. Error messages are still being polished.
 
 ## Enabling
 
 <!-- type=misc -->
 
-The `--experimental-modules` flag can be used to enable features for loading ESM modules.
+The `--experimental-modules` flag can be used to enable features for loading
+ESM modules.
 
-Once this has been set, files ending with `.mjs` will be able to be loaded as ES Modules.
+Once this has been set, files ending with `.mjs` will be able to be loaded
+as ES Modules.
 
 ```sh
 node --experimental-modules my-app.mjs
@@ -28,7 +32,9 @@ node --experimental-modules my-app.mjs
 
 ### Supported
 
-Only the CLI argument for the main entry point to the program can be an entry point into an ESM graph. In the future `import()` can be used to create entry points into ESM graphs at run time.
+Only the CLI argument for the main entry point to the program can be an entry
+point into an ESM graph. In the future `import()` can be used to create entry
+points into ESM graphs at run time.
 
 ### Unsupported
 
@@ -43,21 +49,26 @@ Only the CLI argument for the main entry point to the program can be an entry po
 
 ### No NODE_PATH
 
-`NODE_PATH` is not part of resolving `import` specifiers. Please use symlinks if this behavior is desired.
+`NODE_PATH` is not part of resolving `import` specifiers. Please use symlinks
+if this behavior is desired.
 
 ### No `require.extensions`
 
-`require.extensions` is not used by `import`. The expectation is that loader hooks can provide this workflow in the future.
+`require.extensions` is not used by `import`. The expectation is that loader
+hooks can provide this workflow in the future.
 
 ### No `require.cache`
 
 `require.cache` is not used by `import`. It has a separate cache.
 
 ### URL based paths
 
-ESM are resolved and cached based upon [URL](url.spec.whatwg.org) semantics. This means that files containing special characters such as `#` and `?` need to be escaped.
+ESM are resolved and cached based upon [URL](https://url.spec.whatwg.org/)
+semantics. This means that files containing special characters such as `#` and
+`?` need to be escaped.
 
-Modules will be loaded multiple times if the `import` specifier used to resolve them have a different query or fragment.
+Modules will be loaded multiple times if the `import` specifier used to resolve
+them have a different query or fragment.
 
 ```js
 import './foo?query=1'; // loads ./foo with query of "?query=1"
@@ -70,9 +81,11 @@ For now, only modules using the `file:` protocol can be loaded.
 
 All CommonJS, JSON, and C++ modules can be used with `import`.
 
-Modules loaded this way will only be loaded once, even if their query or fragment string differs between `import` statements.
+Modules loaded this way will only be loaded once, even if their query
+or fragment string differs between `import` statements.
 
-When loaded via `import` these modules will provide a single `default` export representing the value of `module.exports` at the time they finished evaluating.
+When loaded via `import` these modules will provide a single `default` export
+representing the value of `module.exports` at the time they finished evaluating.
 
 ```js
 import fs from 'fs';
@@ -85,4 +98,4 @@ fs.readFile('./foo.txt', (err, body) => {
 });
 ```
 
-[the Node EP for ES Modules]: https://github.com/nodejs/node-eps/blob/master/002-es-modules.md
+[Node.js EP for ES Modules]: https://github.com/nodejs/node-eps/blob/master/002-es-modules.md