One typo in About

There is an extra space in `messaging`

docs/about.rst

@@ -8,7 +8,7 @@ Essentially, it estimates the causal impact of intervention **T** on outcome **Y
 Typical use cases include:
 
 - **Campaign Targeting Optimization**: An important lever to increase ROI in an advertising campaign is to target the ad to the set of customers who will have a favorable response in a given KPI such as engagement or sales. CATE identifies these customers by estimating the effect of the KPI from ad exposure at the individual level from A/B experiment or historical observational data.
-- **Personalized Engagement**: Company has multiple options to interact with its customers such as different product choices in up-sell or mess aging channels for communications. One can use CATE to estimate the heterogeneous treatment effect for each customer and treatment option combination for an optimal personalized recommendation system.
+- **Personalized Engagement**: Company has multiple options to interact with its customers such as different product choices in up-sell or messaging channels for communications. One can use CATE to estimate the heterogeneous treatment effect for each customer and treatment option combination for an optimal personalized recommendation system.
 
 The package currently supports the following methods: