Missing blank after autogenerated parent topic in Markdown output when transformed via parameter args.rellinks=all

[ritti]

Occurs in DITA-OT 3.4 where DITA XML files are transformed to markdown_github with parameter --args.rellinks=all

Result: Parent topic:Introduction

Expected Result: Parent topic: Introduction

Result in MD:

**Parent topic:**[Introduction](../Introduction/Introduction.md)

Expected Result in MD:

**Parent topic:** [Introduction](../Introduction/Introduction.md)