docs: remove redundant '$' in read.rst (#9263)

`:envvar:` automatically prepends a `$` before the variable name provided in between the backticks.
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Alexo 2022-10-06 19:29:17 +00:00 committed by GitHub
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@ -100,7 +100,7 @@ Example
``read`` has a few separate uses.
The following code stores the value 'hello' in the shell variable :envvar:`$foo`.
The following code stores the value 'hello' in the shell variable :envvar:`foo`.
::