Typo corrections

There are some typos in the lecture notes. These have been corrected and uploaded.

Here’s a summary of where the corrections are located:

Notes labelled 1026 (Lagrange Duality)
-  Statement of strong duality before Definition 1
-  (KKT2) equation
- Exercise 4
- Equation (5)

Notes labelled 1104 (Log Barrier)
-  Equation (4)