Fix GAAP misspellings in earnings21 NLP reference files

[migueljette]

• Corrects 42 tokens across 14 transcripts where gap/Gap/GAP/non-gap were transcribed instead of GAAP/non-GAAP in financial reporting contexts
• Also fixes the accompanying case tag (LC→CA for GAAP, LC→MC for non-GAAP, UC→CA for Gap) to be consistent with correctly-spelled GAAP tokens elsewhere in the dataset

  ┌─────────┬──────────────┬───────────────────────┐
  │  File   │ Tokens fixed │    Forms corrected    │
  ├─────────┼──────────────┼───────────────────────┤
  │ 4320211 │ 6            │ non-gap×4, gap×2      │
  ├─────────┼──────────────┼───────────────────────┤
  │ 4344866 │ 3            │ non-gap, gap×2        │
  ├─────────┼──────────────┼───────────────────────┤
  │ 4360366 │ 2            │ non-gap, GAP          │
  ├─────────┼──────────────┼───────────────────────┤
  │ 4360674 │ 4            │ non-gap, gap×3        │
  ├─────────┼──────────────┼───────────────────────┤
  │ 4364366 │ 3            │ non-gap×2, gap        │
  ├─────────┼──────────────┼───────────────────────┤
  │ 4365948 │ 2            │ non-gap×2             │
  ├─────────┼──────────────┼───────────────────────┤
  │ 4366302 │ 2            │ non-gap, gap          │
  ├─────────┼──────────────┼───────────────────────┤
  │ 4382825 │ 2            │ non-gap, gap          │
  ├─────────┼──────────────┼───────────────────────┤
  │ 4383161 │ 1            │ gap                   │
  ├─────────┼──────────────┼───────────────────────┤
  │ 4384964 │ 5            │ non-gap, gap×2, Gap×2 │
  ├─────────┼──────────────┼───────────────────────┤
  │ 4387383 │ 3            │ non-gap×2, gap        │
  ├─────────┼──────────────┼───────────────────────┤
  │ 4389907 │ 5            │ gap×5                 │
  ├─────────┼──────────────┼───────────────────────┤
  │ 4397800 │ 2            │ non-gap, gap          │
  ├─────────┼──────────────┼───────────────────────┤
  │ 4397829 │ 2            │ gap×2                 │
  └─────────┴──────────────┴───────────────────────┘

Test plan

• Verify no remaining gap/Gap/GAP/non-gap tokens in these 14 files that should be GAAP/non-GAAP
• Confirm the 17 remaining gap tokens in the dataset are legitimate uses (price gaps, strategic gaps, time gaps, etc.) and were intentionally left unchanged