Rename read_hats in documentation

[camposandro]

Rename missing read_hats calls in the documentation pages and tutorials. Closes #854.

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Before [5027fd6]	After [221517e]	Ratio	Benchmark (Parameter)
37.9±0.5ms	38.1±0.8ms	1.01	benchmarks.time_polygon_search
6.18±0.05s	6.18±0.02s	1	benchmarks.time_create_large_catalog
80.5±1ms	80.3±1ms	1	benchmarks.time_kdtree_crossmatch
916±6ms	910±2ms	0.99	benchmarks.time_create_midsize_catalog
24.7±0.5ms	24.3±0.2ms	0.98	benchmarks.time_box_filter_on_partition

Click here to view all benchmarks.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.21%. Comparing base (5027fd6) to head (0ae606c).
⚠️ Report is 147 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #904   +/-   ##
=======================================
  Coverage   95.21%   95.21%           
=======================================
  Files          54       54           
  Lines        2570     2570           
=======================================
  Hits         2447     2447           
  Misses        123      123           

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[dougbrn]

Nice, LGTM!