epoxy_latex() should actually use << and >> for open/close delimiter

[gadenbuie]

Currently, < and > are used for the open/close delimiters in epoxy_latex(), but somewhere in the documentation I wrote that it uses double angle brackets.

While single angle brackets are certainly easier to type, it's also easier to run into unavoidable errors if you use assignment operators like <- or actually write < in the text. In these cases, the glue parser simply cannot work with them (because they're inside the expression to be interpolated) and no amount of escaping will make it work.

pkgload::load_all()
#> ℹ Loading epoxy

x <- 0
epoxy_latex("< x <- a >", a = 1)
#> Error in glue_data(.x = .data, ..., .sep = .sep, .envir = glue_env, .open = .open, : Expecting '>'
epoxy_latex("< x <<- a >", a = 2)
#> Error in glue_data(.x = .data, ..., .sep = .sep, .envir = glue_env, .open = .open, : Expecting '>'
epoxy_latex("<< x <- a >>", a = 3, .open = "<<", .close = ">>")
#> 3