docs: Add chezmoiexternal related links to user-guide/reference docs

Add link from the `chezmoiexternal` related page in the *user-guide* to the corresponding page in the *reference* docs (and vice versa).
twpayne · May 7, 2022 · 8168ab9 · 8168ab9
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diff --git a/...ezmoi.io/docs/reference/special-files-and-directories/chezmoiexternal-format.md b/...ezmoi.io/docs/reference/special-files-and-directories/chezmoiexternal-format.md
@@ -118,3 +118,6 @@ re-download unless forced. To force chezmoi to re-download URLs, pass the
         stripComponents = 2
         include = ["*/plugins/**"]
     ```
+
+    Some more examples can be found in the
+    [user guide](/user-guide/include-files-from-elsewhere/).
diff --git a/assets/chezmoi.io/docs/user-guide/include-files-from-elsewhere.md b/assets/chezmoi.io/docs/user-guide/include-files-from-elsewhere.md
@@ -1,5 +1,9 @@
 # Include dotfiles from elsewhere
 
+The sections below contain examples of how to use `.chezmoiexternal.toml` to
+include files from external sources. For more details, check the [reference
+manual](/reference/special-files-and-directories/chezmoiexternal-format/) .
+
 ## Include a subdirectory from a URL
 
 To include a subdirectory from another repository, e.g. [Oh My