tigrc: document fallback for reference-format

doc/tigrc.5.adoc

@@ -179,9 +179,12 @@ The following variables can be set:
 
 	A space-separated string of format strings used for formatting reference
 	names. Wrap the name of the reference type with the characters you would
-	like to use for formatting, e.g. `[tag]` and `<remote>`. If no format is
-	specified for `local-tag`, the format for `tag` is used. Similarly, if no
-	format is specified for `tracked-remote` the `remote` format is used.
+	like to use for formatting, e.g. `[tag]` and `<remote>`.
+	- If no format is specified for `local-tag`, the format for `tag` is used.
+	- If no format is specified for `tracked-remote`, the format for `remote`
+	  is used.
+	- If no format is specified for any other reference type, the format for
+	  `branch` is used.
 	Prefix with `hide:` to not show that reference type, e.g. `hide:remote`.
 	Supported reference types are:
 	 - head			: The current HEAD.

tigrc

@@ -102,10 +102,12 @@ set truncation-delimiter	= ~		# Character drawn for truncations, or "utf-8"
 #  - stash		: The stash.
 #  - prefetch		: Refs prefetched by `git maintenance`.
 #  - other		: Any other reference.
-# If no format is defined for `local-tag` then the one for `tag` is used.
-# Similarly, `remote` is used if no `tracked-remote` format exists.
-# Prefix with `hide:` to not show that reference type, e.g. `hide:remote`.
+#
 # Expects a space-separated list of format strings.
+#  - If no format is specified for `local-tag`, the format for `tag` is used.
+#  - If no format is specified for `tracked-remote`, the format for `remote` is used.
+#  - If no format is specified for any other reference type, the format for `branch` is used.
+# Prefix with `hide:` to not show that reference type, e.g. `hide:remote`.
 set reference-format		= [branch] <tag> {remote} ~replace~
 
 # Settings controlling how content is read from Git