doc: standardize typography for _semantic versioning_

PR-URL: #42401
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Mestery <mestery@protonmail.com>
Reviewed-By: Akhil Marsonya <akhil.marsonya27@gmail.com>
Reviewed-By: Darshan Sen <raisinten@gmail.com>

README.md

@@ -51,7 +51,7 @@ Looking for help? Check out the
 * **Nightly**: Code from the Current branch built every 24-hours when there are
   changes. Use with caution.
 
-Current and LTS releases follow [Semantic Versioning](https://semver.org). A
+Current and LTS releases follow [semantic versioning](https://semver.org). A
 member of the Release Team [signs](#release-keys) each Current and LTS release.
 For more information, see the
 [Release README](https://github.com/nodejs/Release#readme).

doc/api/documentation.md

@@ -29,7 +29,7 @@ The stability indices are as follows:
 <!-- separator -->
 
 > Stability: 1 - Experimental. The feature is not subject to
-> [Semantic Versioning][] rules. Non-backward compatible changes or removal may
+> [semantic versioning][] rules. Non-backward compatible changes or removal may
 > occur in any future release. Use of the feature is not recommended in
 > production environments.
 
@@ -41,7 +41,7 @@ The stability indices are as follows:
 <!-- separator -->
 
 > Stability 3 - Legacy. Although this feature is unlikely to be removed and is
-> still covered by semantic-versioning guarantees, it is no longer actively
+> still covered by semantic versioning guarantees, it is no longer actively
 > maintained, and other alternatives are available.
 
 Features are marked as legacy rather than being deprecated if their use does no
@@ -77,8 +77,8 @@ to the corresponding man pages which describe how the system call works.
 Most Unix system calls have Windows analogues. Still, behavior differences may
 be unavoidable.
 
-[Semantic Versioning]: https://semver.org/
 [V8 JavaScript engine]: https://v8.dev/
+[semantic versioning]: https://semver.org/
 [the contributing guide]: https://github.com/nodejs/node/blob/HEAD/CONTRIBUTING.md
 [the issue tracker]: https://github.com/nodejs/node/issues/new
 [warning]: process.md#event-warning