Fix beta Clippy complaints about rustdoc formatting.

[nuttycom]

No description provided.

[daira]

utACK modulo a typo.

[daira]

$ cargo +beta clippy
[...]
warning: manually reimplementing `is_power_of_two`
  --> zcash_history/src/entry.rs:35:9
   |
35 |         leaves & (leaves - 1) == 0
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `.is_power_of_two()`: `leaves.is_power_of_two()`
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#manual_is_power_of_two
   = note: `#[warn(clippy::manual_is_power_of_two)]` on by default

warning: `zcash_history` (lib) generated 1 warning (run `cargo clippy --fix --lib -p zcash_history` to apply 1 suggestion)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 54.15%. Comparing base (3ea34e8) to head (c947540).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1719      +/-   ##
==========================================
- Coverage   54.15%   54.15%   -0.01%     
==========================================
  Files         176      176              
  Lines       20476    20475       -1     
==========================================
- Hits        11089    11088       -1     
  Misses       9387     9387              

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[daira]

utACK