Add change 24 instructions

how_to/Change_24.md

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+- base: Try different directories when searching for a ref
+
+In the previous change, you might have noticed that we need to spell out the
+full name of a tag (Like *refs/tags/mytag*). This isn't very convenient, we
+would like to have shorter command names. For example, if we've created "mytag"
+tag, we should be able to do `ugit log mytag` rather than having to specify
+`ugit log refs/tags/mytag`.
+
+We'll extend `get_oid` to search in different ref subdirectories when resolving
+a name. We'll search in:
+```
+    Root (.ugit): This way we can specify refs/tags/mytag
+    .ugit/refs: This way we can specify tags/mytag
+    .ugit/refs/tags: This way we can specify mytag
+    .ugit/refs/heads: This will be needed for a future change
+```
+If we find the requested name in any of the directories, return it. Otherwise
+assume that the name is an OID.