docs: Fix a few typos

[timgates42]

There are small typos in:

• docs/api-latest.md
• docs/old-api-docs/api-2.0.0.md
• docs/old-api-docs/api-2.1.0.md
• docs/old-api-docs/api-3.1.9.md
• src/base/base-mixin.js
• src/charts/row-chart.js
• web-src/stock.js

Fixes:

• Should read documentation rather than documention.
• Should read understood rather than undestood.
• Should read parameter rather than paramenter.

Semi-automated pull request generated by https://github.com/timgates42/meticulous/blob/master/docs/NOTE.md

[kum-deepak]

Many thanks! I will merge and release it soon.

We have been working heavily on dc-v5. The new documentation will be at https://dc-js.github.io/

Please go through these and suggest changes.