Update known issues docs #1383

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3 errors and 6 warnings

** (TokenMissingError) lib/has_error.ex:16:1: missing terminator: end (for "do" starting at line 1)

** (SyntaxError) lib/template.eex:2:5: syntax error before: ','

** (TokenMissingError) lib/a.ex:6:7: missing terminator: end (for "do" starting at line 2)

:dialyzer.run_report_modules_changed_and_analyzed/1 is undefined or private

:dialyzer_iplt.plt_and_info_from_file/1 is undefined (module :dialyzer_iplt is not available or is yet to be defined)

variable "arg" is unused (if the variable is not meant to be used, prefix it with an underscore)

variable "x" is unused (if the variable is not meant to be used, prefix it with an underscore)

Macro.to_string/2 is deprecated. Use Macro.to_string/1 instead

variable "x" is unused (if the variable is not meant to be used, prefix it with an underscore)