README.md: Fix about manpage generation

[oech3]

1. Fix binary name
2. Deduplicate cmds to install uudoc

[github-actions]

GNU testsuite comparison:

Skip an intermittent issue tests/tail/overlay-headers (fails in this run but passes in the 'main' branch)

[github-actions]

GNU testsuite comparison:

Skipping an intermittent issue tests/misc/tee (passes in this run but fails in the 'main' branch)
Skipping an intermittent issue tests/tail/overlay-headers (passes in this run but fails in the 'main' branch)

[github-actions]

GNU testsuite comparison:

Skipping an intermittent issue tests/tail/overlay-headers (passes in this run but fails in the 'main' branch)

[codspeed-hq]

CodSpeed Performance Report

Merging #8994 will improve performances by 3.11%

_{Comparing oech3:doc-uudoc (0772737) with main (3b2cb6a)}

Summary

⚡ 3 improvements
✅ 102 untouched
⏩ 74 skipped¹

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
⚡	du_balanced_tree[(5, 4, 10)]	9.3 ms	9.1 ms	+2.03%
⚡	du_human_balanced_tree[(5, 4, 10)]	10.4 ms	10.1 ms	+3.11%
⚡	du_max_depth_balanced_tree[(6, 4, 10)]	33.3 ms	32.3 ms	+3.09%

Footnotes

1. 74 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

[github-actions]

GNU testsuite comparison:

Skip an intermittent issue tests/misc/tee (fails in this run but passes in the 'main' branch)

[github-actions]

GNU testsuite comparison:

Skipping an intermittent issue tests/tail/overlay-headers (passes in this run but fails in the 'main' branch)

[github-actions]

GNU testsuite comparison:

Skip an intermittent issue tests/misc/tee (fails in this run but passes in the 'main' branch)
Skip an intermittent issue tests/tail/overlay-headers (fails in this run but passes in the 'main' branch)

[cakebaker]

Thanks!