fix: missing space/newline between block elements (14 en pages affected)

[jp-knj]

Problem

Space or newline missing between closing punctuation and next word, causing text to run together.

Affected: ~14 en pages × 14 locales ≈ 196 pages total

Example

markflow: "Type: booleanDefault: false"
baseline: "Type: boolean Default: false"

Sample files: en/reference/experimental-flags/*, en/reference/errors/*, en/reference/legacy-flags

Root Cause

Block-level element boundaries not producing whitespace separation in rendered output.