Update file CAPS_marker_analysis.md

assays/biparental_mapping/protocols/CAPS_marker_analysis.md

-**CAPS marker: PCR + digest**
+## CAPS marker: PCR + digest
 
-PCR: 
+**PCR:** 
 - using GoTaq® DNA Polymerase (Promega) according to the manufacturer's protocol with CAPS-marker specific PCR primers
 
-digest:
+**Digest:**
 
 - digesting 5µl of PCR fragments with the CAPS-marker specific restriction enzyme: