Add docstrings for zcash_client_sqlite.

[nuttycom]

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[codecov]

Codecov Report

Merging #363 (88fbd9f) into master (a80fd59) will not change coverage.
The diff coverage is n/a.

❗ Current head 88fbd9f differs from pull request most recent head 78f6432. Consider uploading reports for the commit 78f6432 to get more accurate results

@@           Coverage Diff           @@
##           master     #363   +/-   ##
=======================================
  Coverage   64.84%   64.84%           
=======================================
  Files          70       70           
  Lines        7149     7149           
=======================================
  Hits         4636     4636           
  Misses       2513     2513           

Impacted Files	Coverage Δ
zcash_client_sqlite/src/chain.rs	97.56% <ø> (ø)
zcash_client_sqlite/src/error.rs	15.15% <ø> (ø)
zcash_client_sqlite/src/lib.rs	54.61% <ø> (ø)
zcash_client_sqlite/src/wallet.rs	79.68% <ø> (ø)

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[str4d]

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