Remove net461 from OpenTracing shim

[cijothomas]

#3190 leftover

[codecov]

Codecov Report

Merging #3224 (14c6f2c) into main (e35216a) will increase coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #3224      +/-   ##
==========================================
+ Coverage   85.69%   85.72%   +0.03%     
==========================================
  Files         260      260              
  Lines        9366     9366              
==========================================
+ Hits         8026     8029       +3     
+ Misses       1340     1337       -3     

Impacted Files	Coverage Δ
...metryProtocol/Implementation/ActivityExtensions.cs	92.34% <0.00%> (+0.90%)	⬆️
...ter.ZPages/Implementation/ZPagesActivityTracker.cs	100.00% <0.00%> (+2.85%)	⬆️

[pellared]

LGTM

Here are a few more leftovers:

• opentelemetry-dotnet/README.md

  Line 18 in 11699a3

  Framework 4.6.1`. Any exceptions to this are noted in the individual `README.md`

• opentelemetry-dotnet/src/OpenTelemetry.Api/README.md

  Line 472 in 11699a3

  for versions lower than `.NET Framework 4.6.1`.

• opentelemetry-dotnet/src/OpenTelemetry.Exporter.Jaeger/README.md

  Line 17 in 11699a3

  For .NET Framework, versions 4.6.1 and above are supported.

We can now remove the whole except for versions lower than fragments as AFAIK we will be supporting all supported .NET versions 😉

[cijothomas]

We can now remove the whole except for versions lower than fragments as AFAIK we will be supporting all supported .NET versions 😉

Except .NET Framework 3.5 🤣