minor change to phrasing

Signed-off-by: Nathaniel <[email protected]>

Author: NathanielF

docs/source/notebooks/iv_weak_instruments.ipynb

@@ -126,8 +126,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "In many ways instrumental variable regression is a paradigmatic method of the [credibility revolution in econometrics](https://en.wikipedia.org/wiki/Credibility_revolution#:~:text=In%20economics%2C%20the%20credibility%20revolution,experimental%20and%20quasi%20experimental%20methods.) and the social sciences which followed the [replication crisis](https://en.wikipedia.org/wiki/Replication_crisis). Below we will elaborate how to explore the assumptions of the IV design and highlight the conditions under which it can be sensibly applied. \n",
-    "First we will outline the nature of the causal estimand in IV regressions. Then we shall unpack how these estimation routines work with respect to the above assumptions. We will explore how different ways of interrogating the models and comparing among similar models helps argue for credible results in these IV designs. "
+    "In many ways instrumental variable regression is a paradigmatic method of the [credibility revolution in econometrics](https://en.wikipedia.org/wiki/Credibility_revolution#:~:text=In%20economics%2C%20the%20credibility%20revolution,experimental%20and%20quasi%20experimental%20methods.) and the social sciences. The need to bolster credibility in the social sciences followed from the [replication crisis](https://en.wikipedia.org/wiki/Replication_crisis). Below we will explore the assumptions of the IV design and highlight the conditions under which it can be sensibly applied. First we will outline the nature of the causal estimand in IV regressions. Then we shall unpack how these estimation routines work with respect to the above assumptions. We will the show different ways of interrogating these models, comparing among similar models to argue for the crediblity of the results. "
    ]
   },
   {