minor symfony#17741 [Yaml] fix typos in changelog and upgrade files (xabbuh)

This PR was merged into the 3.1-dev branch.

Discussion
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[Yaml] fix typos in changelog and upgrade files

| Q             | A
| ------------- | ---
| Fixed tickets |
| License       | MIT

Commits
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12c88dd [Yaml] fix typos in changelog and upgrade files

Author: fabpot

UPGRADE-3.1.md

@@ -45,7 +45,7 @@ Yaml
    After:
 
    ```php
-   Yaml::parse('{ "foo": "bar", "fiz": "cat" }', YAML::PARSE_EXCEPTION_ON_INVALID_TYPE);
+   Yaml::parse('{ "foo": "bar", "fiz": "cat" }', Yaml::PARSE_EXCEPTION_ON_INVALID_TYPE);
    ```
 
  * Deprecated support for passing `true`/`false` as the third argument to the
@@ -78,7 +78,7 @@ Yaml
    Yaml::parse('{ "foo": "bar", "fiz": "cat" }', Yaml::PARSE_OBJECT_FOR_MAP);
    ```
 
- * Deprecated support for passing `true`/`false` as the third argument to the `dump()` methods to toggle object support.
+ * Deprecated support for passing `true`/`false` as the fifth argument to the `dump()` method to toggle object support.
 
    Before:
 

UPGRADE-4.0.md

@@ -36,7 +36,7 @@ Yaml
    After:
 
    ```php
-   Yaml::parse('{ "foo": "bar", "fiz": "cat" }', YAML::PARSE_EXCEPTION_ON_INVALID_TYPE);
+   Yaml::parse('{ "foo": "bar", "fiz": "cat" }', Yaml::PARSE_EXCEPTION_ON_INVALID_TYPE);
    ```
 
  * Removed support for passing `true`/`false` as the third argument to the
@@ -69,7 +69,7 @@ Yaml
    Yaml::parse('{ "foo": "bar", "fiz": "cat" }', Yaml::PARSE_OBJECT_FOR_MAP);
    ```
 
- * Removed support for passing `true`/`false` as the third argument to the `dump()` methods to toggle object support.
+ * Removed support for passing `true`/`false` as the fifth argument to the `dump()` method to toggle object support.
 
    Before:
 

src/Symfony/Component/Yaml/CHANGELOG.md

@@ -7,7 +7,7 @@ CHANGELOG
  * Added support for customizing the YAML parser behavior through an optional bit field:
 
    ```php
-   Yaml::parse('{ "foo": "bar", "fiz": "cat" }', Yaml::EXCEPTION_ON_INVALID_TYPE | Yaml::PARSE_OBJECT | Yaml::PARSE_OBJECT_FOR_MAP);
+   Yaml::parse('{ "foo": "bar", "fiz": "cat" }', Yaml::PARSE_EXCEPTION_ON_INVALID_TYPE | Yaml::PARSE_OBJECT | Yaml::PARSE_OBJECT_FOR_MAP);
    ```
 
  * Added support for customizing the dumped YAML string through an optional bit field: