Improve open-telemetry/context documentation

[Nevay]

No description provided.

[codecov]

Codecov Report

Merging #830 (17647dd) into main (be3f88f) will increase coverage by 0.08%.
The diff coverage is n/a.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #830      +/-   ##
============================================
+ Coverage     82.46%   82.54%   +0.08%     
+ Complexity     1878     1877       -1     
============================================
  Files           230      232       +2     
  Lines          4893     4893              
============================================
+ Hits           4035     4039       +4     
+ Misses          858      854       -4     

Flag	Coverage Δ
7.4	82.55% <ø> (+0.08%)	⬆️
8.0	82.57% <ø> (+0.08%)	⬆️
8.1	82.57% <ø> (+0.08%)	⬆️

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Impacted Files	Coverage Δ
src/Extension/Propagator/B3/B3MultiPropagator.php	100.00% <0.00%> (ø)
src/Extension/Propagator/B3/B3SinglePropagator.php	98.55% <0.00%> (ø)
...c/API/Trace/Propagation/TraceContextPropagator.php	100.00% <0.00%> (ø)
src/API/Trace/SpanContextValidator.php	100.00% <0.00%> (ø)
...rc/API/Trace/Propagation/TraceContextValidator.php	100.00% <0.00%> (ø)
src/API/Trace/SpanContext.php	90.90% <0.00%> (+7.98%)	⬆️

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