Fix layout of Outbounds table on debug page

[jkanywhere]

The two header rows on the HTML table for Outbounds on the debug page now have the same number of cells.

This will make the columns line up properly.

• [x] Description and context for reviewers: one partner, one stranger
• [x] Docs (package doc)
• [x] Entry in CHANGELOG.md

[jkanywhere]

Before:

After:

[jronak]

@jkanywhere license/cla check seems to be stuck (you could push the same amended commit to trigger this check again)

[codecov[bot]]

Codecov Report

Merging #2130 (cfbe060) into dev (707eebc) will decrease coverage by 0.05%. The diff coverage is n/a.

:exclamation: Current head cfbe060 differs from pull request most recent head 02264c0. Consider uploading reports for the commit 02264c0 to get more accurate results

@@            Coverage Diff             @@
##              dev    #2130      +/-   ##
==========================================
- Coverage   87.75%   87.70%   -0.06%     
==========================================
  Files         253      251       -2     
  Lines       14090    14041      -49     
==========================================
- Hits        12365    12314      -51     
- Misses       1336     1338       +2     
  Partials      389      389              

Impacted Files	Coverage Δ
x/debug/debug.go	86.95% <ø> (ø)
transport/tchannel/peer.go	94.73% <0.00%> (-2.64%)	:arrow_down:
dispatcher_startup.go	91.07% <0.00%> (-1.79%)	:arrow_down:
peer/hashring32/internal/hashring32/hashring32.go	96.21% <0.00%> (-1.09%)	:arrow_down:
internal/observability/graph.go	93.12% <0.00%> (-0.63%)	:arrow_down:
transport/internal/tlsmux/listener.go
transport/internal/tlsmux/conn_sniffer.go

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