Improve the debug help command message (#9098)
Improve the debug help command message (#9098)

cleanups:
1: Re-introduce debug leak subcommand in help text.
Mistankenly deleted in https://github.com/redis/redis/pull/5531

2: Formatted the text.
Some text lacks commas resulting in no line breaks.

3: Supplementary debug restart command descriptions of delay arg.
soloestoy/redis,PKRoma/redis,ofirluzon/redis,ofirluzon/redis,neomantra/redis,antirez/redis,antirez/redis,antirez/redis,soloestoy/redis,charsyam/redis,oranagra/redis,charsyam/redis,PKRoma/redis,yossigo/redis,soloestoy/redis,charsyam/redis,yossigo/redis,soloestoy/redis,charsyam/redis,soloestoy/redis,ofirluzon/redis,charsyam/redis,neomantra/redis,PKRoma/redis,neomantra/redis,neomantra/redis,yossigo/redis,PKRoma/redis,oranagra/redis,yossigo/redis,ofirluzon/redis,oranagra/redis,ofirluzon/redis,neomantra/redis,PKRoma/redis,antirez/redis,oranagra/redis,yossigo/redis,oranagra/redis