added contrib fn note, added link to group key definition

content/v2.0/reference/flux/stdlib/contrib/rows/map.md

@@ -15,7 +15,8 @@ related:
 
 The `rows.map()` function is an alternate implementation of [`map()`](/v2.0/reference/flux/stdlib/built-in/transformations/map/)
 that is faster, but more limited than `map()`.
-`rows.map()` cannot modify table groups key and, therefore, does not need to regroup tables.
+`rows.map()` cannot modify [groups keys](/v2.0/reference/glossary/#group-key) and,
+therefore, does not need to regroup tables.
 **Attempts to change columns in the group key are ignored.**
 
 _**Function type:** Transformation_

layouts/partials/article.html

@@ -4,6 +4,7 @@
     {{ partial "article/product-tags.html" . }}
     {{ partial "article/stable-version.html" . }}
     {{ partial "article/flux-experimental.html" . }}
+    {{ partial "article/flux-contrib.html" . }}
     {{ .Content }}
     {{ partial "article/related.html" . }}
     {{ partial "article/tags.html" . }}

layouts/partials/article/flux-contrib.html

@@ -0,0 +1,22 @@
+{{ $currentVersion := (index (findRE "[^/]+.*?" .RelPermalink) 0) .RelPermalink }}
+{{ $contribPath := print "/" $currentVersion "/reference/flux/stdlib/contrib/" }}
+
+{{ if in .RelPermalink $contribPath }}
+  {{ if not (eq .RelPermalink $contribPath) }}
+    {{ if eq .Kind "page" }}
+      {{ $name := replaceRE `^\w*\.\w*\(\)` "<code>$0</code>" .Title }}
+      <div class="note block">
+        <p>
+          The {{ $name | safeHTML }} is a user-contributed function maintained by the <a href="#package-author-and-maintainer">package author</a>.
+        </p>
+      </div>
+    {{ else if eq .Kind "section" }}
+      <div class="note block">
+        <p>
+          The {{ if $.Params.list_title }}{{ $.Params.list_title }}{{ else }}{{ .Title }}{{ end }}
+          is a user-contributed package maintained by the <a href="#package-author-and-maintainer">package author</a>.
+        </p>
+      </div>
+    {{ end }}
+  {{ end }}
+{{ end }}