Update cheatsheets

tldr/float

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# float
+
+> Declare floating point variable(s).
+> Equivalent to `typeset -E` except that options irrelevant to floating point numbers are not permitted.
+> See also: `typeset`, `declare`.
+> More information: <https://manned.org/zshbuiltins>.
+
+- Declare a floating point variable:
+
+`float {{variable_name}}`
+
+- Declare a floating point variable while assigning its value:
+
+`float {{variable_name}}={{value}}`
+
+- Declare multiple floating point variables:
+
+`float {{var1=value1 var2=value2 ...}}`
+
+- Display defined variables:
+
+`float`