docs: fix typos in example code comments

[Avicennasis]

Summary

Fixes 13 typos in JSDoc/block comments across 6 example folders. Comments only - no executable code is touched and no identifiers are renamed.

• map-with-pedestrian-route-from-a-to-b/demo.js: Opens/Closes a infobubble -> an infobubble; can be found the full JS + HTML code -> can be found in the full JS + HTML code
• map-with-route-from-a-to-b-using-public-transport/demo.js: same two fixes
• reverse-geocode-an-address-from-location/demo.js: same two fixes
• search-for-landmark/demo.js: same two fixes
• geocode-a-location-from-address/demo.js: same two fixes
• geocode-a-location-from-structured-address/demo.js: same two fixes, plus address details of 425 Randolph St -> details of 425 Randolph St (stray double space)

On an infobubble: open-infobubble/demo.js already uses the correct article, so this just brings the other examples in line.

Deliberately left alone

The misspelled function names addManueversToMap / addManueversToPanel ("Manuevers" -> "Maneuvers") appear in map-with-pedestrian-route-from-a-to-b, map-with-route-from-a-to-b-using-public-transport and map-with-route-from-a-to-b. They are real identifiers with declarations and call sites, and these files are copy-paste starting points for developers, so I did not rename them - that is a maintainer call, not a typo fix.

The same two comment typos also appear in map-with-route-from-a-to-b/demo.js (both) and map-with-isoline-route/demo.js (can be found the full). I kept this PR to the files I had verified, but I'm happy to extend it to those two if you'd prefer the whole repo consistent in one go.

No functional changes.