Documentation improvements: Fix typos, bugs, and inconsistencies

[ChrisRackauckas-Claude]

Summary

This PR fixes several documentation issues to improve accuracy and consistency:

• Fixed typo: "Google Collab" → "Google Colab"
• Fixed typo: "tolernace" → "tolerance"
• Fixed critical bug: DDE example had constant_lags incorrectly assigned tspan value instead of constant_lags variable (affected both README.md and vignettes/dde.Rmd)
• Fixed inconsistencies: Changed list() to c() for tspan in vignettes (ode.Rmd, sde.Rmd) to match README and proper R vector syntax
• Standardized pipe operators: Updated %>% to |> (native R 4.1+ pipe) in dae.Rmd and dde.Rmd for consistency with README
• Added missing code: Included the interpolation example sol$.(0.2) in ode.Rmd that was referenced but not shown

Test plan

• Reviewed all changes for accuracy
• Verified syntax corrections match R best practices
• Confirmed consistency between README and vignettes
• Validated that the DDE bug fix uses correct variable assignment

Files changed

• README.md: Fixed typos and DDE bug
• vignettes/ode.Rmd: Added missing code example, fixed tspan syntax
• vignettes/sde.Rmd: Fixed tspan syntax
• vignettes/dde.Rmd: Fixed critical bug and pipe operator
• vignettes/dae.Rmd: Standardized pipe operator

@ChrisRackauckas - These are practical documentation improvements that fix bugs and inconsistencies.

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