[RTD] Fixes documentation (#1412)

**Context:**

![Before](https://github.com/user-attachments/assets/3ec337c1-a898-4abd-a9c6-990d8767679c)

**Description of the Change:**


![After](https://github.com/user-attachments/assets/a07c6a1c-f98d-4b00-b9aa-9afd0a893673)

**Benefits:** No floating `}` and well formatted contents.

**Possible Drawbacks:** Do we also want to show the libraries we use?

**Related GitHub Issues:**

Author: erick-xanadu

doc/index.rst

@@ -54,11 +54,11 @@ Catalyst
 
 .. mdinclude:: ../README.md
   :start-line: 20
-  :end-line: 73
+  :end-line: 72
 
 .. mdinclude:: ../README.md
-  :start-line: 142
-  :end-line: 163
+  :start-line: 134
+  :end-line: 155
 
 .. toctree::
    :maxdepth: 2