Spyder: Equation is not displayed in Help pane on Windows

Description

Equation is not displayed in help pane in windows.
Equation is displayed in help pane in linux(manjaro).

What steps will reproduce the problem?

1. type -> from numpy import convolve
2. request help info of convolve

[windows]

[majaro]

Versions

• Spyder version: 4.0.0b3
• Python version: 3.7.3
• Qt version: 5.9.6
• PyQt5 version: 5.9.2
• Operating System: Windows 10

Dependencies

pygments >=2.0    :  2.3.1 (OK)
qdarkstyle >=2.6.4:  2.7 (OK)
sphinx >=0.6.6    :  1.8.5 (OK)
pyls >=0.27.0     :  0.27.0 (OK)
nbconvert >=4.0   :  5.4.1 (OK)
pandas >=0.13.1   :  0.24.2 (OK)
numpy >=1.7       :  1.16.2 (OK)
sympy >=0.7.3     :  1.3 (OK)
cython >=0.21     :  0.29.6 (OK)
qtconsole >=4.5.0 :  4.5.1 (OK)
IPython >=4.0     :  7.4.0 (OK)
matplotlib >=2.0.0:  3.0.3 (OK)
pylint >=0.25     :  2.3.1 (OK)