docs: Cleanup whitespace.

[seanbright]

This patch:

• Trims lines containing only whitespace
• Squeezes multiple blank lines in to one
• Removes all trailing blank lines

[seanbright]

Essentially:

# Trim lines containing only whitespace
find . -name '*.md' -exec sed -i -r 's/^\s+$//' '{}' \;

# Squeeze blank lines
find . -name '*.md' -exec sed -i '/\S/,/^\s*$/!d' '{}' \;

# Remove trailing blank lines
find . -name '*.md' -exec sed -i ':a;/^[ \n]*$/{$d;N;ba}' '{}' \;

[gtjoseph]

@seanbright In markdown, two or more whitespace characters at the end of a line forces a line break. You may have to scan the changes manually to see if any were intentional or not. If you think a line break is warranted, you may want to replace the trailing spaces with <br>.

[seanbright]

two or more whitespace characters at the end of a line forces a line break

Gross. I'll just remove the trimming part then.