Remove 'csr' entry from RISC-V glossary

Removed the entry for 'csr' from the glossary.

Signed-off-by: Kersten Richter <kersten@riscv.org>

Author: kersten1

src/glossary.adoc

@@ -3,8 +3,6 @@
 
 This glossary includes definitions of terms specific to RISC-V as well as terms that are useful in understanding the architectures and technologies in use by RISC-V contributors and users.
 
-csr
-
 [glossary]
 [[ABI]]ABI:: Application Binary Interface. Abstractions and interfaces between applications and the AEE that control interactions. See 1.1. RISC-V Privileged Software Stack Terminology.