Docs: Undefined {**} operator

https://docs.circom.io/circom-language/basic-operators/

Ctrl+F {**} on that page linked above

Part way down the page, {**} gets used twice, and then never mentioned again.

** is defined (as exponentiation), but the { and } braces are not (at least not anywhere else on that page).

Unclear if it has a special meaning, or is just meant to help disambiguate nested parens, or specifying order of operations, or what exactly.

Permalink to relevant markdown file:

circom/mkdocs/docs/circom-language/basic-operators.md

Lines 108 to 110 in 9f3da35

    
           *  ```x << k = (x*(2{**}k)~ & ~mask) % p  ```  
        
           where b is the number of significant bits of p and mask is ```2{**}b - 1```.

Brackets must be removed from the documentation since they do not mean anything. Solved! Thanks

	* ```x << k = (x(2{*}k)~ & ~mask) % p ```

	where b is the number of significant bits of p and mask is ```2{**}b - 1```.