Cross references are not resolved in overwritten fields.

**DocFX Version Used**:
2.34
**Template used**:
default
**Steps to Reproduce**:

1. Overwrite summary (or parameter's description) in the yaml header of corresponding *.md file with text containing cross reference. (e.g. '\[Some text\](xref:System.Byte)').
2. Build docfx project.

**Expected Behavior**:
resolved cross reference
**Actual Behavior**:
reference is unresolved