README + process.md: Update directory name and parameters to current + fix Markdown warnings

[bact]

• Update example to match new directory structure: tests/data/xxx.json -> tests/spdx/data/xxx.json
• Update spec-parser parameters and output directory to current
• Remove trailing spaces
• Ensure one blank line before and after headings/lists
• Enforce one H1 heading in a document, the rest will be H2, H3, etc.
• Standardize the use of bullet markup (using all -, instead of mixing - and * in the same file)
• Ensure 4-space indent for nested lists