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string interpolation escape example (#10966)

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* string interpolation escape example

Make it easier to find the documentation, and the example might be enough for most cases.

Co-authored-by: Robert Hensing <roberth@users.noreply.github.com>
Co-authored-by: Valentin Gagarin <valentin.gagarin@tweag.io>
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doc/manual/src/language/string-interpolation.md
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@ -43,6 +43,47 @@ configureFlags = "
Note that Nix expressions and strings can be arbitrarily nested;
in this case the outer string contains various interpolated expressions that themselves contain strings (e.g., `"-thread"`), some of which in turn contain interpolated expressions (e.g., `${mesa}`).
To write a literal `${` in an regular string, escape it with a backslash (`\`).
> **Example**
>
> ```nix
> "echo \${PATH}"
> ```
>
> "echo ${PATH}"
To write a literal `${` in an indented string, escape it with two single quotes (`''`).
> **Example**
>
> ```nix
> ''
> echo ''${PATH}
> ''
> ```
>
> "echo ${PATH}\n"
`$${` can be written literally in any string.
> **Example**
>
> In Make, `$` in file names or recipes is represented as `$$`, see [GNU `make`: Basics of Variable Reference](https://www.gnu.org/software/make/manual/html_node/Reference.html#Basics-of-Variable-References).
> This can be expressed directly in the Nix language strings:
>
> ```nix
> ''
> MAKEVAR = Hello
> all:
> @export BASHVAR=world; echo $(MAKEVAR) $${BASHVAR}
> ''
> ```
>
> "MAKEVAR = Hello\nall:\n\t@export BASHVAR=world; echo $(MAKEVAR) $\${BASHVAR}\n"
See the [documentation on strings][string] for details.
### Path
Rather than writing