docs: update commit-ish default branch (#5205)

* docs: update commit-ish default branch

To match with https://github.com/npm/cli/blob/latest/docs/content/using-npm/developers.md#what-is-a-package

Author: dijonkitchen

docs/content/commands/npm-install.md

@@ -311,7 +311,7 @@ into a tarball (b).
     can be any valid semver range or exact version, and npm will look for
     any tags or refs matching that range in the remote repository, much as
     it would for a registry dependency. If neither `#<commit-ish>` or
-    `#semver:<semver>` is specified, then `master` is used.
+    `#semver:<semver>` is specified, then the default branch is used.
 
     As with regular git dependencies, `dependencies` and `devDependencies`
     will be installed if the package has a `prepare` script before the

docs/content/configuring-npm/package-json.md

@@ -632,7 +632,7 @@ commit. If the commit-ish has the format `#semver:<semver>`, `<semver>` can
 be any valid semver range or exact version, and npm will look for any tags
 or refs matching that range in the remote repository, much as it would for
 a registry dependency. If neither `#<commit-ish>` or `#semver:<semver>` is
-specified, then `master` is used.
+specified, then the default branch is used.
 
 Examples: