Documentation/tutorial: Fix markdown heading in Part 3

Part of the content was on the same line as the heading.

Change-Id: Ia19487d80e9f004d59f96ff09e1f3de4f37c2f77
Signed-off-by: Nicholas Chin <nic.c3.14@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/67000
Reviewed-by: Felix Singer <felixsinger@posteo.net>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/Documentation/tutorial/part3.md b/Documentation/tutorial/part3.md
index 83b3408..ff07ece 100644
--- a/Documentation/tutorial/part3.md
+++ b/Documentation/tutorial/part3.md
@@ -23,10 +23,10 @@
 by the code that satisfies them, the process of writing tests and adding
 them to the tree is the same.
 
-## Analysis of unit under test First of all, it is necessary to
-precisely establish what we want to test in a particular module. Usually
-this will be an externally exposed API, which can be used by other
-modules.
+## Analysis of unit under test
+First of all, it is necessary to precisely establish what we want to
+test in a particular module. Usually this will be an externally exposed
+API, which can be used by other modules.
 
 ```eval_rst
 .. admonition:: i2c-test example