feat(docs): Added documentation for the 'Java-Spring-Boot.txt' wordlist

Related to #1220

Author: ItsIgnacioPortal

Discovery/Web-Content/Programming-Language-Specific/README.md

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+## Java-Spring-Boot.txt
+Use for: Detecting actuator endpoints, and testing for RCEs in Spring-Boot instances.
+
+Note that it's possible for a spring-boot backend to be behind a spring-cloud-gateway, which may _only_ route all traffic prefixed with `/api/` to the backend. Consider fuzzing the starting prefix `api` with many different values to find what reaches the backend. A recommended wordlist to fuzz this value with is at `Fuzzing/Miscellaneous/schemes.txt`