add documentation

Signed-off-by: Sebastian Malton <sebastian@malton.name>

docs/rules/jsx-tag-spacing.md

@@ -62,7 +62,7 @@ Examples of **correct** code for this rule, when configured with `{ "closingSlas
 
 ### `beforeSelfClosing`
 
-This check can be set to `"always"`, `"never"` or `"allow"` (to disable it).
+This check can be set to `"always"`, `"never"`, `"multiline-always"`, or `"allow"` (to disable it).
 
 If it is `"always"`, the check warns whenever a space is missing before the closing bracket. If `"never"` then it warns if a space is present before the closing bracket. The default value of this check is `"always"`.
 
@@ -102,6 +102,26 @@ Examples of **correct** code for this rule, when configured with `{ "beforeSelfC
 />
 ```
 
+Examples of **incorrect** code for this rule, when configured with `{ "beforeSelfClosing": "multiline-always" }`:
+
+```jsx
+<Hello
+  firstName="John"
+  lastName="Smith" />
+<Hello
+  firstName="John"
+  lastName="Smith"/>
+```
+
+Examples of **correct** code for this rule, when configured with `{ "beforeSelfClosing": "multiline-always" }`:
+
+```jsx
+<Hello
+  firstName="John"
+  lastName="Smith"
+/>
+```
+
 ### `afterOpening`
 
 This check can be set to `"always"`, `"never"`, `"allow-multiline"` or `"allow"` (to disable it).
@@ -179,7 +199,7 @@ Examples of **correct** code for this rule, when configured with `{ "afterOpenin
 
 ### `beforeClosing`
 
-This check can be set to `"always"`, `"never"`, or `"allow"` (to disable it).
+This check can be set to `"always"`, `"never"`, `"multiline-always"`, or `"allow"` (to disable it).
 
 If it is `"always"` the check warns whenever whitespace is missing before the closing bracket of a JSX opening element or whenever a space is missing before the closing bracket closing element. If `"never"`, then it warns if a space is present before the closing bracket of either a JSX opening element or closing element. This rule will never warn for self closing JSX elements. The default value of this check is `"allow"`.
 
@@ -219,6 +239,31 @@ Examples of **correct** code for this rule, when configured with `{ "beforeClosi
 </Hello>
 ```
 
+Examples of **incorrect** code for this rule, when configured with `{ "beforeClosing": "multiline-always" }`:
+
+```jsx
+<Hello
+  firstName="John"
+  lastName="Smith">
+</Hello>
+<Hello
+  firstName="John"
+  lastName="Smith" >
+  Goodbye
+</Hello>
+```
+
+Examples of **correct** code for this rule, when configured with `{ "beforeClosing": "multiline-always" }`:
+
+```jsx
+<Hello
+  firstName="John"
+  lastName="Smith"
+>
+  Goodbye
+</Hello>
+```
+
 ## When Not To Use It
 
 You can turn this rule off if you are not concerned with the consistency of spacing in or around JSX brackets.