Sort docstring by precedence

[ahuang11]

#443

[coveralls]

Coverage increased (+0.1%) to 79.753% when pulling acfa0b4 on ahuang11:docstring_precedence into 5d67174 on holoviz:master.

[ahuang11]

Okay thanks for the suggestion. It now follows: https://panel.holoviz.org/gallery/param/precedence.html

[ahuang11]

Any other changes needed?

[jbednar]

Nope; looks great! I think it's ready to merge once the tests are passing. Not sure what's up with those, and probably won't have a chance to look at that today.

[ahuang11]

I wonder if tests are failing because the order changed?

==================================
Parameters changed from their default values are marked in red.
Soft bound values are marked in cyan.
C/V= Constant/Variable, RO/RW = ReadOnly/ReadWrite, AN=Allow None
NameValue   Type     Bounds      Mode  
v    4    Number                C RW  
w    4    Number                C RO  
u    4    Number                V RW  
z    4    Number  (-1, 100)     V RW  
x   None  String              V RW AN 
y    4    Number  (-1, None)    V RW  
Parameter docstrings:
=====================
u: < No docstring available >
v: < No docstring available >
w: < No docstring available >
x: < No docstring available >
y: < No docstring available >
z: < No docstring available >
RAW STRING:
"\x1b[1;32mParameters of 'TestClass' instance\n==================================\n\x1b[0m\n\x1b[1;31mParameters changed from their default values are marked in red.\x1b[0m\n\x1b[1;36mSoft bound values are marked in cyan.\x1b[0m\nC/V= Constant/Variable, RO/RW = ReadOnly/ReadWrite, AN=Allow None\n\n\x1b[1;34mNameValue   Type     Bounds      Mode  \x1b[0m\n\nv    4    Number                C RW  \nw    4    Number                C RO  \nu    4    Number                V RW  \nz    4    Number  (-1, 100)     V RW  \nx   None  String              V RW AN \ny    4    Number  (-1, None)    V RW  \n\n\x1b[1;32mParameter docstrings:\n=====================\x1b[0m\n\n\x1b[1;34mu: < No docstring available >\x1b[0m\n\x1b[1;31mv: < No docstring available >\x1b[0m\n\x1b[1;34mw: < No docstring available >\x1b[0m\n\x1b[1;31mx: < No docstring available >\x1b[0m\n\x1b[1;34my: < No docstring available >\x1b[0m\n\x1b[1;31mz: < No docstring available >\x1b[0m"
FAIL
test_bad_compute_default (tests.API0.testlistselector.TestListSelectorParameters) ... WARNING:param.ParameterizedMetaclass: Use method 'params' via param namespace 

[jlstevens]

I wonder if tests are failing because the order changed?

I think that is possible. Otherwise, I like this PR and would be happy to see it merged once the tests are green!

[philippjfr]

Will merge and fix up the tests separately.