Correct sigma distance in new footnote, moving less topical material to

the footnote.

doc/funnel.md

@@ -122,9 +122,9 @@ First, though methodology here is more careful than average, this is just a one
 (machine, OS, source tree, reg-ex, locale) test to demo one wrapper script
 possibility for `funnel`.  Second, this is a 0 match test.  Linus' name is not
 misspelled this way in his big project.  Third, mean of the best 3/10[^1] are
-reproduced run-to-run to within its stderrs[^2].  E.g., the first wall time pair
-is 0.72 sigma apart, and all are within 5 sigma.[^3] While other things can (and
-maybe should) be done[^4], we use the min of the 2 trials next.
+reproduced run-to-run to within its stderrs[^2] or at least within 5 sigma.[^3]
+While other things can (and maybe should) be done[^4], we use the min of the 2
+trials next.
 
 Interpreting in more detail, here `rg` is 310498/299533 =~ 1.037X faster.  Since
 I found no way to disable `rg` dir scans/.., it is more fair to subtract an `rg
@@ -166,14 +166,16 @@ error propagation](https://en.wikipedia.org/wiki/Propagation_of_uncertainty)
 holds, `sig(A-B)=(sigA**2+sigB**2)**.5`, for example.  "Numbers of sigma" refer
 to `|A-B|/sig(A-B)`, an informal two-sided Student T test for zero-hood.  In a
 Nim setting, https://github.com/SciNim/Measuremancer also has more details.
+Sigma distances of the 5 wall time pairs are: 114/30=3.8, 9/28=0.32, 6/5=1.2,
+2/10=0.2, and 93/21=4.4.
 
 [^3]: A common workaround for hostile, unknown heavy tails in particle physics
 is to use 5 rather than 3 sigma as a "strong" threshold.  This actually may be
 too optimistic for "computer system timing noise", especially depending on
 background activity like web browsers/..where I occasionally see 10+ sigma.
 
 [^4]: E.g. using a global min over all 20 runs, possibly adjusted & with error
-estimates.
+estimates.  [tim](tim.md) docs have some more color on difficulties here.
 
 [^5]: On multi-CPU computers, even shell pipelines are "parallel programming"
 with OS kernels doing the heavy lifting.  People too readily receive wisdom