fix(docs): fix `take_till`

[vwkd]

Remove reference to take_till1 deprecated in #450.

Not sure, if the following sentence also needs to be updated or is still correct?

take_till(f) is equivalent to take_while(0.., \|c\| !f(c))

[coveralls]

Pull Request Test Coverage Report for Build 7826433617

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 42.668%

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Totals
Change from base Build 7819097216:	0.0%
Covered Lines:	1318
Relevant Lines:	3089

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💛 - Coveralls

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (338b15d) 0.00% compared to head (eca2905) 42.66%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #465 +/- ## ========================================= + Coverage 0 42.66% +42.66% ========================================= Files 0 18 +18 Lines 0 3089 +3089 ========================================= + Hits 0 1318 +1318 - Misses 0 1771 +1771 ```

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