[new] add rule documentations

documentation/errors.md

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+
+## Errors
+
+
+### [Comma dangle](http://eslint.org/docs/rules/comma-dangle)
+
+> require trailing commas in multiline object literals
+
+
+✖ Disabled
+
+<br />
+
+
+
+### [No cond assign](http://eslint.org/docs/rules/no-cond-assign)
+
+> disallow assignment in conditional expressions
+
+
+&#10003; Enabled (error)
+
+<br />
+
+
+
+### [No console](http://eslint.org/docs/rules/no-console)
+
+> disallow use of console
+
+
+&#10003; Enabled (warning)
+
+<br />
+
+
+
+### [No constant condition](http://eslint.org/docs/rules/no-constant-condition)
+
+> disallow use of constant expressions in conditions
+
+
+&#10003; Enabled (warning)
+
+<br />
+
+
+
+### [No control regex](http://eslint.org/docs/rules/no-control-regex)
+
+> disallow control characters in regular expressions
+
+
+&#10003; Enabled (error)
+
+<br />
+
+
+
+### [No debugger](http://eslint.org/docs/rules/no-debugger)
+
+> disallow use of debugger
+
+
+&#10003; Enabled (error)
+
+<br />
+
+
+
+### [No dupe args](http://eslint.org/docs/rules/no-dupe-args)
+
+> disallow duplicate arguments in functions
+
+
+&#10003; Enabled (error)
+
+<br />
+
+
+
+### [No dupe keys](http://eslint.org/docs/rules/no-dupe-keys)
+
+> disallow duplicate keys when creating object literals
+
+
+&#10003; Enabled (error)
+
+<br />
+
+
+
+### [No duplicate case](http://eslint.org/docs/rules/no-duplicate-case)
+
+> disallow a duplicate case label.
+
+
+&#10003; Enabled (error)
+
+<br />
+
+
+
+### [No empty character class](http://eslint.org/docs/rules/no-empty-character-class)
+
+> disallow the use of empty character classes in regular expressions
+
+
+&#10003; Enabled (error)
+
+<br />
+
+
+
+### [No empty](http://eslint.org/docs/rules/no-empty)
+
+> disallow empty statements
+
+
+&#10003; Enabled (error)
+
+<br />
+
+
+
+### [No ex assign](http://eslint.org/docs/rules/no-ex-assign)
+
+> disallow assigning to the exception in a catch block
+
+
+&#10003; Enabled (error)
+
+<br />
+
+
+
+### [No extra boolean cast](http://eslint.org/docs/rules/no-extra-boolean-cast)
+
+> disallow double-negation boolean casts in a boolean context
+
+
+&#10006; Disabled
+
+<br />
+
+
+
+### [No extra parens](http://eslint.org/docs/rules/no-extra-parens)
+
+> disallow unnecessary parentheses
+
+
+&#10006; Disabled
+
+<br />
+
+
+
+### [No extra semi](http://eslint.org/docs/rules/no-extra-semi)
+
+> disallow unnecessary semicolons
+
+
+&#10003; Enabled (error)
+
+<br />
+
+
+
+### [No func assign](http://eslint.org/docs/rules/no-func-assign)
+
+> disallow overwriting functions written as function declarations
+
+
+&#10003; Enabled (error)
+
+<br />
+
+
+
+### [No inner declarations](http://eslint.org/docs/rules/no-inner-declarations)
+
+> disallow function or variable declarations in nested blocks
+
+
+&#10003; Enabled (error)
+
+<br />
+
+
+
+### [No invalid regexp](http://eslint.org/docs/rules/no-invalid-regexp)
+
+> disallow invalid regular expression strings in the RegExp constructor
+
+
+&#10003; Enabled (error)
+
+<br />
+
+
+
+### [No irregular whitespace](http://eslint.org/docs/rules/no-irregular-whitespace)
+
+> disallow irregular whitespace outside of strings and comments
+
+
+&#10003; Enabled (error)
+
+<br />
+
+
+
+### [No negated in lhs](http://eslint.org/docs/rules/no-negated-in-lhs)
+
+> disallow negation of the left operand of an in expression
+
+
+&#10003; Enabled (error)
+
+<br />
+
+
+
+### [No obj calls](http://eslint.org/docs/rules/no-obj-calls)
+
+> disallow the use of object properties of the global object (Math and JSON) as functions
+
+
+&#10003; Enabled (error)
+
+<br />
+
+
+
+### [No prototype builtins](http://eslint.org/docs/rules/no-prototype-builtins)
+
+> disallow use of Object.prototypes builtins directly
+
+
+&#10003; Enabled (error)
+
+<br />
+
+
+
+### [No regex spaces](http://eslint.org/docs/rules/no-regex-spaces)
+
+> disallow multiple spaces in a regular expression literal
+
+
+&#10003; Enabled (error)
+
+<br />
+
+
+
+### [No sparse arrays](http://eslint.org/docs/rules/no-sparse-arrays)
+
+> disallow sparse arrays
+
+
+&#10003; Enabled (error)
+
+<br />
+
+
+
+### [No unexpected multiline](http://eslint.org/docs/rules/no-unexpected-multiline)
+
+> Avoid code that looks like two expressions but is actually one
+
+
+&#10006; Disabled
+
+<br />
+
+
+
+### [No unreachable](http://eslint.org/docs/rules/no-unreachable)
+
+> disallow unreachable statements after a return, throw, continue, or break statement
+
+
+&#10003; Enabled (error)
+
+<br />
+
+
+
+### [No unsafe finally](http://eslint.org/docs/rules/no-unsafe-finally)
+
+> disallow return/throw/break/continue inside finally blocks
+
+
+&#10003; Enabled (error)
+
+<br />
+
+
+
+### [Use isnan](http://eslint.org/docs/rules/use-isnan)
+
+> disallow comparisons with the value NaN
+
+
+&#10003; Enabled (error)
+
+<br />
+
+
+
+### [Valid jsdoc](http://eslint.org/docs/rules/valid-jsdoc)
+
+> ensure JSDoc comments are valid
+
+
+&#10003; Enabled (warning)
+
+<br />
+
+
+
+### [Valid typeof](http://eslint.org/docs/rules/valid-typeof)
+
+> ensure that the results of typeof are compared against a valid string
+
+
+&#10003; Enabled (error)
+
+<br />
+
+