Update help for serve command arguments

[dbanck]

This PR updates the help section for the serve command.

Variables in arguments must be lower-case and without a ., e.g.

terraform-ls serve -cpuprofile='/Users/dbanck/tmp/profile-{{timestamp}}.pprof'`

[radeksimko]

Thanks, confirmed from

terraform-ls/internal/pathtpl/pathtpl.go

Lines 19 to 23 in 7c44da6

	tpl = tpl.Funcs(template.FuncMap{
	"timestamp": time.Now().Local().Unix,
	"pid": os.Getpid,
	"ppid": os.Getppid,
	})

We could go further in clarifying that these are in fact templating functions, rather than variables (variables do use the .CamelCase syntax, functions are without the dot and typically lowercase).

That said don't treat it as blocker - this is already improving things significantly! 😄

[dbanck]

We could go further in clarifying that these are in fact templating functions

At first, I had it like that, but I found it somewhat confusing after rereading it since it assumes that the user has some knowledge of Go template syntax.

From a user's perspective, this looks like a string with optional placeholders; that's why I would suggest calling them variables or placeholders.

[radeksimko]

Totally fair - merge at will! 👍🏻

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