Website: Update MetaData section

[cgiachalis]

Metadata section is missing three functions. This is because within pkgdown yaml the topic matching lists all functions with suffix "metadata" e.g., ends_with("metadata"), but not all metadata functions follow that pattern.

library(tiledb)

fns_tiledb <- apropos("^tiledb")

fns_metadata <- fns_tiledb[grepl("metadata", fns_tiledb, fixed = TRUE)]

fns_metadata[!endsWith(fns_metadata, "metadata")]
#> [1] "tiledb_fragment_info_get_unconsolidated_metadata_num"
#> [2] "tiledb_group_get_metadata_from_index"                
#> [3] "tiledb_group_metadata_num"

This PR fixes the issue by using matches("metadata").

Another two points you might want to reflect:

1. naming consistency e.g., tiledb_num_metadata() vs tiledb_group_metadata_num() (it's this example that triggered the PR)

2. pkgdown reference index builds its contents using selectors excessively even for individual functions; as a result it creates cluttered sections on some occasions, see Array section

[johnkerl]

Thanks @cgiachalis !

[cgiachalis]

Thanks!