Update README.md

Typo fix.

README.md

@@ -4,7 +4,7 @@ BuildStockQuery is a python library designed to simplify and streamline the proc
 
 BuildStockQuery offers an intuitive Object-Oriented Programming (OOP) interface to the ResStock output dataset allowing users to easily perform common queries and receive results in familiar pandas DataFrame format, abstracting away the need for complex SQL query. By initializing a query object with the pertinent Athena database and table names, users can easily query for various kinds of insights, for example, timeseries electricity for an end use for a given state grouped by building types.
 
-Dcumentation and walkthrough: https://github.com/NREL/buildstock-query/wiki
+Documentation and walkthrough: https://github.com/NREL/buildstock-query/wiki
 
 Usage examples: https://github.com/NREL/buildstock-query/tree/main/example_usage