Adjustment in Installation command in kanister new-docs

[anishbista60]

Is your feature request related to a problem? Please describe.

• I try to copy paste the command for kanister operator installation from newdocs.
• The first command helm repo add kanister <https://charts.kanister.io/> throws error

bash: syntax error near unexpected token `newline'

• While second command shows

anishbista@anishbista-RedmiBook-15-Pro:~$ helm -n kanister upgrade \--install kanister \--create-namespace
kanister/kanister-operator
Error: "helm upgrade" requires 2 arguments

Usage:  helm upgrade [RELEASE] [CHART] [flags]
bash: kanister/kanister-operator: No such file or directory

• And so on.

Describe the solution you'd like

• Provide the commands in proper format so that folks won't have to fix it again.

[github-actions]

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