Move the parser tree to a more fitting file name.

docs/docs/parser-tree.rst

@@ -0,0 +1,36 @@
+.. _parser-tree:
+
+Parser Tree
+===========
+
+Usage
+-----
+
+.. automodule:: parso.python
+    :members:
+    :undoc-members:
+
+
+Parser Tree Base Class
+----------------------
+
+All nodes and leaves have these methods/properties:
+
+.. autoclass:: parso.tree.NodeOrLeaf
+    :members:
+    :undoc-members:
+
+
+Python Parser Tree
+------------------
+
+.. automodule:: parso.python.tree
+    :members:
+    :undoc-members:
+    :show-inheritance:
+
+
+Utility
+-------
+
+.. autofunction:: parso.tree.search_ancestor