[docs] [issue29892] change statement for open() is splited into two part in middle of sentence.

[OSAMU NAKAMURA]

New submission from OSAMU NAKAMURA:

In https://docs.python.org/3.6/library/functions.html#open , 
Following sentence is wrongly separated by extra asterisk.

```
FileExistsError is now raised if the file opened in exclusive
creation mode ('x') already exists.
```

This mistake is introduced by https://github.com/python/cpython/commit/3929499914d47365ae744df312e16da8955c90ac#diff-30d76a3dc0c885f86917b7d307ccf279

----------
assignee: docs at python
components: Documentation
messages: 290070
nosy: OSAMU.NAKAMURA, docs at python
priority: normal
severity: normal
status: open
title: change statement for open() is splited into two part in middle of sentence.
versions: Python 3.6

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29892>
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