Clarified the "malformed capabilities" definition

[jasonyu1996]

This attempts to address #310 by clarifying the definition of "malformed capabilities". The relationship between valid capabilities and malformed capabilities is now separately mentioned as what CHERI instructions check and enforce.

[andresag01]

@jasonyu1996 : Could you also add yourself to the list of contributors if you haven't already? Thanks! https://github.com/riscv/riscv-cheri/blob/main/src/contributors.adoc

riscv-cheri/src/riscv-cheri.adoc

Line 2 in ffd9d11

Authors: Hesham Almatary, Andres Amaya Garcia, John Baldwin, David Chisnall, Jessica Clarke, Brooks Davis, Nathaniel Wesley Filardo, Franz A. Fuchs, Timothy Hutt, Alexandre Joannou, Tariq Kurd, Ben Laurie, Marno van der Maas, A. Theodore Markettos, David McKay, Jamie Melling, Stuart Menefy, Simon W. Moore, Peter G. Neumann, Robert Norton, Alexander Richardson, Michael Roe, Peter Rugg, Peter Sewell, Carl Shaw, Robert N. M. Watson, Jonathan Woodruff

[jasonyu1996]

@jasonyu1996 : Could you also add yourself to the list of contributors if you haven't already? Thanks! https://github.com/riscv/riscv-cheri/blob/main/src/contributors.adoc

riscv-cheri/src/riscv-cheri.adoc

Line 2 in ffd9d11

Authors: Hesham Almatary, Andres Amaya Garcia, John Baldwin, David Chisnall, Jessica Clarke, Brooks Davis, Nathaniel Wesley Filardo, Franz A. Fuchs, Timothy Hutt, Alexandre Joannou, Tariq Kurd, Ben Laurie, Marno van der Maas, A. Theodore Markettos, David McKay, Jamie Melling, Stuart Menefy, Simon W. Moore, Peter G. Neumann, Robert Norton, Alexander Richardson, Michael Roe, Peter Rugg, Peter Sewell, Carl Shaw, Robert N. M. Watson, Jonathan Woodruff

I did that just now. Thanks!