Revert "Fix to show all errors per line"

This reverts commit c54804c.

Add setlocal suffixesadd=.erl

Improve behaviour skeletons

Catch when EDoc exits on error

This happens when EDoc tries to analyze a module where the spec
declarations are not exactly above the functions they describe. This is
an example with the module `ssl' which causes these kind of troubles:

---8<-- ssl.erl ------------------------------------------------------------------
-spec start() -> ok  | {error, reason()}.
-spec start(permanent | transient | temporary) -> ok | {error, reason()}.
start() ->
    application:start(crypto),
    application:start(public_key),
    application:start(ssl).

start(Type) ->
    application:start(crypto, Type),
    application:start(public_key, Type),
    application:start(ssl, Type).
---8<--------------------------------------------------------------------

With this solution, an error is shown, but at least the module_info/1
function is used to give the rest of the module's exported functions.

Updates doc

Fixes: module functions not shown when omnicompleting local module

Cosmetic

Help file finished

Minor code refactor

Typo