docs: update publish docs: dist-tag + publish case (#7560)

<!-- What / Why -->
<!-- Describe the request in detail. What it does and why it's being
changed. -->
Updates `publish` command docs:
 - Refers to `npm tag` which is now `npm dist-tag`
 - Add docs specific for `npm publish --tag`

## References
<!-- Examples:
  Related to #0
  Depends on #0
  Blocked by #0
  Fixes #0
  Closes #0
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tap-snapshots/test/lib/docs.js.test.cjs

@@ -1612,12 +1612,15 @@ See also the \`ca\` config.
 If you ask npm to install a package and don't tell it a specific version,
 then it will install the specified tag.
 
-Also the tag that is added to the package@version specified by the \`npm tag\`
-command, if no explicit tag is given.
+It is the tag added to the package@version specified in the \`npm dist-tag
+add\` command, if no explicit tag is given.
 
 When used by the \`npm diff\` command, this is the tag used to fetch the
 tarball that will be compared with the local files by default.
 
+If used in the \`npm publish\` command, this is the tag that will be added to
+the package submitted to the registry.
+
 
 
 #### \`tag-version-prefix\`

workspaces/config/lib/definitions/definitions.js

@@ -2012,11 +2012,14 @@ const definitions = {
       If you ask npm to install a package and don't tell it a specific version,
       then it will install the specified tag.
 
-      Also the tag that is added to the package@version specified by the \`npm
-      tag\` command, if no explicit tag is given.
+      It is the tag added to the package@version specified in the 
+      \`npm dist-tag add\` command, if no explicit tag is given.
 
       When used by the \`npm diff\` command, this is the tag used to fetch the
       tarball that will be compared with the local files by default.
+      
+      If used in the \`npm publish\` command, this is the tag that will be 
+      added to the package submitted to the registry.
     `,
     flatten (key, obj, flatOptions) {
       flatOptions.defaultTag = obj[key]