Changed markdown to rst, fixed a typo.

Signed-off-by: Maciej Kurc <mkurc@antmicro.com>

tests/internal_conn/README.rst

diff --git a/tests/internal_conn/README.md b/tests/internal_conn/README.rst
similarity index 72%
rename from tests/internal_conn/README.md
rename to tests/internal_conn/README.rst
index 8a33949..8f71bed 100644
--- a/tests/internal_conn/README.md
+++ b/tests/internal_conn/README.rst
@@ -1,7 +1,9 @@
-# A test for cells with "passthrough" modes and direct pin-to-pin connections.
+A test for cells with "passthrough" modes and direct pin-to-pin connections.
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 
 This tests checks two cases:
 
 1. A cell may have some of its input pins connected directly to its output pins internally. In such a case that connection has to be expressed within its interconnect. This test does exactly that.
-2. Given a cell which has a "passthrough" mode with no child cells and a direct input to output connection, no pb_type for the "passthrough" mode should be generated. Moreover, the interconnect that holds the input to output connection should be defined directly undet the "mode" tag.
+
+2. Given a cell which has a "passthrough" mode with no child cells and a direct input to output connection, no pb_type for the "passthrough" mode should be generated. Moreover, the interconnect that holds the input to output connection should be defined directly under the "mode" tag.