Update connection instructions in devtools header

[darrenburns]

No description provided.

[codecov-commenter]

Codecov Report

Merging #469 (84a37e4) into css (386aa6d) will increase coverage by 14.63%.
The diff coverage is 56.25%.

@@             Coverage Diff             @@
##              css     #469       +/-   ##
===========================================
+ Coverage   38.06%   52.69%   +14.63%     
===========================================
  Files          85      101       +16     
  Lines        6526     8317     +1791     
===========================================
+ Hits         2484     4383     +1899     
+ Misses       4042     3934      -108     

Flag	Coverage Δ
unittests	52.69% <56.25%> (+14.63%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/textual/_event_broker.py	50.00% <ø> (+50.00%)	⬆️
src/textual/drivers/win32.py	0.00% <0.00%> (ø)
src/textual/drivers/windows_driver.py	0.00% <0.00%> (ø)
src/textual/layout.py	0.00% <0.00%> (-29.92%)	⬇️
src/textual/renderables/blank.py	0.00% <0.00%> (ø)
src/textual/renderables/gradient.py	0.00% <0.00%> (ø)
src/textual/scrollbar.py	0.00% <0.00%> (ø)
src/textual/views/_dock_view.py	0.00% <0.00%> (ø)
src/textual/views/_document_view.py	0.00% <0.00%> (ø)
src/textual/views/_grid_view.py	0.00% <0.00%> (ø)
... and 98 more

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[olivierphi]

👍 !