documentation: add tutorial for first contribution

diff --git a/Documentation/technical/api-history-graph.txt b/Documentation/technical/api-history-graph.txt
index 18142b6d29283bbf6e325ce71d50761a3f50a227..d0d1707c8c88560196eeb0d8bfe3be3362b682ea 100644 (file)
--- a/Documentation/technical/api-history-graph.txt
+++ b/Documentation/technical/api-history-graph.txt
@@ -80,7 +80,7 @@ Calling sequence
   it is invoked.
 
 * For each commit, call `graph_next_line()` repeatedly, until
-  `graph_is_commit_finished()` returns non-zero.  Each call go
+  `graph_is_commit_finished()` returns non-zero.  Each call to
   `graph_next_line()` will output a single line of the graph.  The resulting
   lines will not contain any newlines.  `graph_next_line()` returns 1 if the
   resulting line contains the current commit, or 0 if this is merely a line
@@ -115,7 +115,6 @@ struct commit *commit;
 struct git_graph *graph = graph_init(opts);
 
 while ((commit = get_revision(opts)) != NULL) {
-       graph_update(graph, commit);
        while (!graph_is_commit_finished(graph))
        {
                struct strbuf sb;