Remove incorrect whitespace before triple backtick

Signed-off-by: Jason T. Brown <[email protected]>

Author: vpipkt

pyrasterframes/src/main/python/docs/raster-join.pymd

@@ -57,7 +57,7 @@ The following optional arguments are allowed:
 
  Note that the `join_exprs` will override the join behavior described above. By default the expression is equivalent to:
 
- ```python, evaluate=False
+```python, join_expr, evaluate=False
 st_intersects(
     st_geometry(left[left_extent]), 
     st_reproject(st_geometry(right[right_extent]), right[right_crs], left[left_crs])