Align market column + revert 4 NGM collisions

Follow-up to maintainer review on JerBouma#143: the `market` column was left
unchanged when the `exchange` codes were corrected. Aligned 576 rows
so `market` matches the canonical FD value for each new `exchange`:

  NYQ -> "New York Stock Exchange"
  NMS -> "NASDAQ Global Select"
  NCM -> "NASDAQ Capital Market"
  PNK / OQB / OID -> "OTC Bulletin Board"
  PCX -> "NYSE Arca"

Reverted 4 rows whose exchange had been set to "NGM":
  * yfinance returned "NGM" meaning NASDAQ Global Market
  * but FD's "NGM" code is already used for "Nordic Growth Market"
    (Sweden) -- 270 existing rows
  * to avoid creating an ambiguous code, those 4 rows go back to "ASE"
    until FD adds a distinct code for NASDAQ Global Market

Symbols reverted: BEEP, BHIL, CHACU, VOLT.

Total fixed-by-this-PR is now 576 (down from 580).

Author: dokson