IMPORTANT NOTE:

Starting with Biostrings 2.81.3 (Bioconductor 3.24), the “MultipleAlignment Objects” vignette is located in the MultipleAlignment package.

Install the MultipleAlignment package with:

if (!require("BiocManager", quietly=TRUE))
    install.packages("BiocManager")
BiocManager::install("MultipleAlignment")

and access the “MultipleAlignment Objects” vignette with:

browseVignettes("MultipleAlignment")