Docs: double dash seems to be not correct

[larsvomsee]

Dear Guys,

looks like there is a typo in the install.md. With my helm version I get a error unknown argument.

helm version:
version.BuildInfo{Version:"v3.16.1", GitCommit:"5a5449dc42be07001fd5771d56429132984ab3ab", GitTreeState:"clean", GoVersion:"go1.22.7"}

cmd:
helm search repo reports-server --l

error:
Error: unknown flag: --l

Code line:

reports-server/docs/INSTALL.md

Line 31 in c0d75ef

helm search repo reports-server --l

man page:
-l, --versions show the long listing, with each version of each chart on its own line, for repositories you have added

solution:

helm search repo reports-server -l
or
helm search repo reports-server --versions