[docs] [issue31571] Redundand information on Doc/reference/lexical_analysis.rst

[Mariatta Wijaya]

Mariatta Wijaya added the comment:

I think we can remove 
```
As of Python 3.3 it is possible again to prefix ..."
```
and keep the other one where it says:
```
.. versionadded:: 3.3
   Support for the unicode legacy literal ....
```

About the sentence about numeric literals that appears twice: it appears on different sections of the language reference documentation. It's very likely for a person to only read one section and not the other. I think it's ok to have them in different places like that.

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nosy: +Mariatta

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<https://bugs.python.org/issue31571>
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