all: change single blank comment to blank line

[yuyi98]

This PR change single blank comment to blank line.

• Make the codes cleaner.

[spytheman]

Hm, https://github.com/vlang/v/actions/runs/10315732767/job/28558261008 was interesting...

There seems to be a scanner panic, uncovered by that comment removal 🤔 .

=========================================
/tmp/v_1001/../../../../../../home/runner/work/v/v/vlib/builtin/builtin.c.v:83: at panic_debug: Backtrace
/tmp/v_1001/../../../../../../home/runner/work/v/v/vlib/builtin/string.v:1099: by string_substr
/tmp/v_1001/../../../../../../home/runner/work/v/v/vlib/v/scanner/scanner.v:1471: by v__scanner__Scanner_decode_u32_escape_single
/tmp/v_1001/../../../../../../home/runner/work/v/v/vlib/v/scanner/scanner.v:1357: by v__scanner__Scanner_ident_string
/tmp/v_1001/../../../../../../home/runner/work/v/v/vlib/v/scanner/scanner.v:801: by v__scanner__Scanner_text_scan
/tmp/v_1001/../../../../../../home/runner/work/v/v/vlib/v/scanner/scanner.v:599: by v__scanner__Scanner_scan_remaining_text
/tmp/v_1001/../../../../../../home/runner/work/v/v/vlib/v/scanner/scanner.v:588: by v__scanner__Scanner_scan_all_tokens_in_buffer
/tmp/v_1001/../../../../../../home/runner/work/v/v/vlib/v/scanner/scanner.v:152: by v__scanner__new_scanner
examples/2048/2048_fuzz.v:343:15: parser failure: crash, 
/tmp/v_1001/../../../../../../home/runner/work/v/v/vlib/v/parser/parser.v:194: by v__parser__parse_text
/tmp/v_1001/../../../../../../home/runner/work/v/v/cmd/tools/vtest-parser.v:59: by main__main
/tmp/v_1001/../../../../../../tmp/v_1001/vtest-parser.01J4V4R8M3DF9XR5QJ3W0DEW8E.tmp.c:57526: by main

[spytheman]

The panic is fixed on master, in 793b66d .