[Patch v3] string-list: Document STRING_LIST_INIT_* macros.

[Thiago Farina <tfransosi@gmail.com>]

Clarify the modern ways to initialize a string_list. Text roughly
based on the analogous passage from api-strbuf.txt.

(Note: Based on the demo patch of Jonathan Nieder).

Signed-off-by: Thiago Farina <tfransosi@gmail.com>
---
 Documentation/technical/api-string-list.txt |   16 ++++++++++------
 1 files changed, 10 insertions(+), 6 deletions(-)

diff --git a/Documentation/technical/api-string-list.txt b/Documentation/technical/api-string-list.txt
index 3f575bd..f689163 100644
--- a/Documentation/technical/api-string-list.txt
+++ b/Documentation/technical/api-string-list.txt
@@ -11,10 +11,15 @@ The caller:
 
 . Allocates and clears a `struct string_list` variable.
 
-. Initializes the members. You might want to set the flag `strdup_strings`
-  if the strings should be strdup()ed. For example, this is necessary
-  when you add something like git_path("..."), since that function returns
-  a static buffer that will change with the next call to git_path().
+. Initializes the members. A string_list might be initialize by
+  `= STRING_LIST_INT_NODUP` or `= STRING_LIST_INIT_DUP` before it can be used.
+
+  Strings in lists initialized with the _DUP variant will be
+  automatically strdup()ed on insertion and free()ed on removal.
+  For example, this is necessary when you add something like
+  git_path("..."), since that function returns a static buffer
+  that will change with the next call to git_path().
+
 +
 If you need something advanced, you can manually malloc() the `items`
 member (you need this if you add things later) and you should set the
@@ -34,10 +39,9 @@ member (you need this if you add things later) and you should set the
 Example:
 
 ----
-struct string_list list;
+struct string_list list = STRING_LIST_DUP;
 int i;
 
-memset(&list, 0, sizeof(struct string_list));
 string_list_append(&list, "foo");
 string_list_append(&list, "bar");
 for (i = 0; i < list.nr; i++)
-- 
1.7.2.3.313.gcd15