Correct typo

Author: davidhewitt

guide/src/building_and_distribution.md

@@ -4,7 +4,7 @@ This chapter of the guide goes into detail on how to build and distribute projec
 
 The material in this chapter is intended for users who have already read the PyO3 [README](#index.md). It covers in turn the choices that can be made for Python modules and for Rust binaries. There is also a section on the end about cross-compiling projects using PyO3.
 
-There is an additional sub-chapters dedicated to [supporting multiple Python versions](./building_and_distribution/multiple_python_versions.html).
+There is an additional sub-chapter dedicated to [supporting multiple Python versions](./building_and_distribution/multiple_python_versions.html).
 
 ## Configuring the Python version