[PATCH] string_list API: document what "sorted" means.

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Junio pointed out that the sort order currently used by string_list
could be considered to be an implementation detail internal to
string_list.  But the sort order is already visible to the outside
world (e.g., via iteration or via print_string_list()), so it
shouldn't be changed willy-nilly.  Therefore, document the current
sort order as part of the API's contract.

(If, at some future time, somebody wants a string_list that is sorted
by a different criterion, then the order should be made specifiable
via a callback function specified by the user.)

Signed-off-by: Michael Haggerty <mhagger@xxxxxxxxxxxx>
---
 Documentation/technical/api-string-list.txt | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/Documentation/technical/api-string-list.txt b/Documentation/technical/api-string-list.txt
index 155ac8c..94d7a2b 100644
--- a/Documentation/technical/api-string-list.txt
+++ b/Documentation/technical/api-string-list.txt
@@ -1,8 +1,9 @@
 string-list API
 ===============
 
-The string_list API offers a data structure and functions to handle sorted
-and unsorted string lists.
+The string_list API offers a data structure and functions to handle
+sorted and unsorted string lists.  A "sorted" list is one whose
+entries are sorted by string value in `strcmp()` order.
 
 The 'string_list' struct used to be called 'path_list', but was renamed
 because it is not specific to paths.
@@ -143,7 +144,7 @@ write `string_list_insert(...)->util = ...;`.
 
 `sort_string_list`::
 
-	Make an unsorted list sorted.
+	Sort the list's entries by string value in `strcmp()` order.
 
 `unsorted_string_list_has_string`::
 
-- 
1.7.11.3

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