docs: Fix a few typos

[timgates42]

There are small typos in:

• cola/cluster/master.py
• cola/core/bloomfilter/init.py
• cola/core/opener.py

Fixes:

• Should read experimentally rather than experimently.
• Should read entries rather than enteries.
• Should read continuously rather than continously.

Semi-automated pull request generated by https://github.com/timgates42/meticulous/blob/master/docs/NOTE.md