[docs] add Rectors orde example

docs/HowItWorks.md

@@ -11,17 +11,17 @@
 ## 2. Parse and Reconstruct 1 File
 
 The iteration of files, nodes and Rectors respects this life cycle:
- 
+
 ```php
 foreach ($fileInfos as $fileInfo) {
     // 1 file => nodes
     $nodes = $phpParser->parseFileInfo($fileInfo);
-    
-    // nodes => 1 node 
+
+    // nodes => 1 node
     foreach ($nodes as $node) { // rather traverse all of them
         foreach ($rectors as $rector) {
             if ($rector->isCandidate($node)) {
-                $rector->reconstructr($node);
+                $rector->reconstruct($node);
             }
         }
     }
@@ -33,21 +33,39 @@ foreach ($fileInfos as $fileInfo) {
 - File is parsed by [`nikic/php-parser`](https://github.com/nikic/PHP-Parser), 4.0-dex (this is important, because this version support writing modified tree back to file)
 - Then nodes (array of objects by parser) are traversed by `StandaloneTraverseNodeTraverser` to prepare it's metadata, e.g. class name, method node the node is in, namespace name etc. added by `$node->setAttribute(Attribute::CLASS_NODE, 'value')`.
 
-### 2.2 Rectify Phase  
- 
+### 2.2 Rectify Phase
+
 - When all nodes are ready, applicies iterates all active Rector
 - Each nodes is passed to `$rector->isCandidate($node)` method to see, if this Rector should do some work on it, e.g. is this class name called `OldClassName`?
 - If it doesn't match, it goes to next node.
 - If it matches, the `$rector->reconstruct($node)` method is called
 - Active Rector changes all what he should and returns changed node
 
+### 2.2.1 Order of Rectors
+
+- Rectors are run by they natural order in config, first will be run first.
+
+E.g. in this case, first will be changed `@expectedException` annotation to method,
+ then a method `setExpectedException` to `expectedException`.
+
+```yml
+# rector.yml
+rectors:
+    Rector\Rector\Contrib\PHPUnit\ExceptionAnnotationRector: ~
+
+    Rector\Rector\Dynamic\MethodNameReplacerRector:
+        'PHPUnit\Framework\TestClass':
+            'setExpectedException': 'expectedException'
+            'setExpectedExceptionRegExp': 'expectedException'
+```
+
 ### 2.3 Save File/Diff Phase
 
-- When work on all nodes of 1 file is done, the file will be saved if it has some changes 
+- When work on all nodes of 1 file is done, the file will be saved if it has some changes
 - Or if the `--dry-run` option is on, it will store the *git-like* diff thanks to [GeckoPackages/GeckoDiffOutputBuilder](https://github.com/GeckoPackages/GeckoDiffOutputBuilder)
 - Then go to next file
 
 ## 3 Reporting
 
-- After this Rector displays list of changed files 
+- After this Rector displays list of changed files
 - Or with `--dry-run` option the diff of these files