Fix 3 broken links in documentation

Co-authored-by: mmcky <8263752+mmcky@users.noreply.github.com>

Author: Copilot

lectures/about_py.md

@@ -117,7 +117,6 @@ It is used and supported extensively by large tech firms including
 
 * [Google](https://www.google.com/)
 * [OpenAI](https://openai.com/)
-* [Netflix](https://www.netflix.com/)
 * [Meta](https://opensource.fb.com/)
 * [Amazon](https://www.amazon.com/)
 * [Reddit](https://www.reddit.com/)

lectures/pandas.md

@@ -606,7 +606,7 @@ time from the World Bank.
 
 The World Bank [collects and organizes data](https://data.worldbank.org/indicator) on a huge range of indicators.
 
-For example, [here's](https://data.worldbank.org/indicator/GC.DOD.TOTL.GD.ZS/countries) some data on government debt as a ratio to GDP.
+For example, [here's](https://data.worldbank.org/indicator/GC.DOD.TOTL.GD.ZS) some data on government debt as a ratio to GDP.
 
 The next code example fetches the data for you and plots time series for the US and Australia
 

lectures/writing_good_code.md

@@ -189,8 +189,6 @@ But as a programmer, your aim should be to **automate** repetition, **not** do i
 
 More importantly, repeating the same logic in different places means that eventually one of them will likely be wrong.
 
-If you want to know more, read the excellent summary found on [this page](https://code.tutsplus.com/tutorials/3-key-software-principles-you-must-understand--net-25161).
-
 We'll talk about how to avoid repetition below.
 
 ### Minimize Global Variables