[DOCS] Wrong description in "13.2.1. Read Committed Isolation Level"

The following documentation comment has been logged on the website:

Page: https://www.postgresql.org/docs/10/static/transaction-iso.html
Description:

In section "13.2.1. Read Committed Isolation Level" the document states that
"it never sees either uncommitted data or changes committed during query
execution by concurrent transactions" but this is exactly the same as
"Repeatable Read Isolation Level". Also in the last sentence of the
paragraph it says "if other transactions commit changes after the first
SELECT starts and before the second SELECT starts" meaning that it could see
the commited data from other concurrent transaction which is completely
contradict with the previous statement.

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