The function symbol candidate generator can be used to search function symbols along with their documentation. When being created, you can provide it with the following options:
A regular expression which the symbol’s name must match in order for it to be considered a candidate. For example, if you wanted to search org functions, you could use the regular expression “^org”.
When set to true, the candidate generator will only make documents for symbols that are defined as commands (i.e. with (interactive)).
Search for commands as if you were in the selected major mode and ran
M-X (execute-extended-command-for-buffer) in a buffer of that mode.