DOC: add examples to build_block_contiguity

[dancejod]

Added Examples section to build_block_contiguity docstring

[jGaboardi]

@dancejod Thanks for the PR! Can you run ruff check libpysal and ruff format libpysal locally to fix the linting and formatting errors? After that please repush.

[codecov[bot]]

Codecov Report

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

Project coverage is 85.0%. Comparing base (bcabdbc) to head (601ecf5). Report is 5 commits behind head on main.

Additional details and impacted files

[](https://app.codecov.io/gh/pysal/libpysal/pull/702?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pysal) ```diff @@ Coverage Diff @@ ## main #702 +/- ## ======================================= - Coverage 85.0% 85.0% -0.0% ======================================= Files 141 141 Lines 15203 15204 +1 ======================================= - Hits 12924 12919 -5 - Misses 2279 2285 +6 ``` | [Files](https://app.codecov.io/gh/pysal/libpysal/pull/702?dropdown=coverage&src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pysal) | Coverage Δ | | |---|---|---| | [libpysal/graph/base.py](https://app.codecov.io/gh/pysal/libpysal/pull/702?src=pr&el=tree&filepath=libpysal%2Fgraph%2Fbase.py&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pysal#diff-bGlicHlzYWwvZ3JhcGgvYmFzZS5weQ==) | `97.9% <100.0%> (ø)` | | ... and [1 file with indirect coverage changes](https://app.codecov.io/gh/pysal/libpysal/pull/702/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pysal)

[dancejod]

@jGaboardi thanks, all done!

[martinfleis]

pre-commit.ci autofix