Add Madhura as a document author

spring-boot-project/spring-boot-docs/src/main/asciidoc/index.adoc

 = Spring Boot Reference Guide
-Phillip Webb; Dave Syer; Josh Long; Stéphane Nicoll; Rob Winch; Andy Wilkinson; Marcel Overdijk; Christian Dupuis; Sébastien Deleuze; Michael Simons; Vedran Pavić; Jay Bryant
+Phillip Webb; Dave Syer; Josh Long; Stéphane Nicoll; Rob Winch; Andy Wilkinson; Marcel Overdijk; Christian Dupuis; Sébastien Deleuze; Michael Simons; Vedran Pavić; Jay Bryant; Madhura Bhave
 :doctype: book
 :toc:
 :toclevels: 4