float: add page

[satteomama]

Checklist

• [✅ ] The page(s) are in the correct platform directories: common, linux, osx, windows, sunos, android, etc.
• [ ✅ ] The page description(s) have links to documentation or a homepage.
• [ ✅ ] The page(s) follow the content guidelines.
• [✅ ] The page(s) follow the style guide.
• [ ✅ ] The PR contains at most 5 new pages.
• [✅ ] The PR is authored by me, or has been human-reviewed if it was created with AI or machine translation software.
• [ ✅ ] The PR title conforms to the recommended templates.
• Version of the command being documented (if known): zsh 5.9
• Reference issue: # 21002

[CLAassistant]

All committers have signed the CLA.

[TheRootDaemon]

Suggested change

	> Equivalent to `typeset -E`.
	> Equivalent to `typeset -E` except that options irrelevant to floating point numbers are not permitted.
	> See also: `typeset`, `declare`.

[TheRootDaemon]

Suggested change

	`float {{var1}} {{var2}} {{var3}}`
	`float {{var1=value}} {{var2=value}} {{var3=value}}`

[dmmqz]

float {{var1=value1 var2=value2 ...}} is more commonly used in these cases.

https://github.com/tldr-pages/tldr/blob/main/contributing-guides/style-guide.md#grouping-placeholders

[TheRootDaemon]

Could you test the last example which is Specifies the number of significant digits

I do not know why but it displays the declared variables

 ~ ➜ : float qq=123.123
 ~ ➜ : float
qq=1.231230000e+02
 ~ ➜ : float -E qq
 ~ ➜ : float -E 3.3
qq=1.231230000e+02

[dmmqz]

I am getting the same behavior for the -E flag as @TheRootDaemon. I don't think this flag is a valid option.