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bugsymfony#3791 Property access tweaks (weaverryan)

This PR was merged into the master branch.Discussion----------Property access tweaks| Q | A| ------------- | ---| Doc fix? | yes| New docs? | no| Applies to | 2.5+| Fixed tickets |symfony#3729Hi guys!This follows aftersymfony#3729 - it includes several small suggestions made by@wouterj and@xabbuh.Additionally, this removes the 3rd argument to `isWritable`, which was removed in the orignal PR (symfony/symfony#10570) and didn't make it into the final feature.Thanks!Commits-------fb9fe99 [symfony#3729] Removing 3rd argument to isWritable - this doesn't exist in the final merged item319bf29 [symfony#3729] Making minor changes thansk to@wouterj and@xabbuh.

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components/property_access
- introduction.rst

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`‎components/property_access/introduction.rst‎`

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Original file line number	Diff line number	Diff line change
`@@ -314,12 +314,13 @@ Checking Property Paths`
`314`	`314`
`315`	`315`	`..versionadded::2.5`
`316`	`316`	`The methods`
`317`		-:method:`PropertyAccessor::isReadable<Symfony\\Component\\PropertyAccess\\PropertyAccessor::isReadable>`
	`317`	+:method:`PropertyAccessor::isReadable<Symfony\\Component\\PropertyAccess\\PropertyAccessor::isReadable>`
`318`	`318`	`and`
`319`		-:method:`PropertyAccessor::isWritable<Symfony\\Component\\PropertyAccess\\PropertyAccessor::isWritable>`
`320`		`- methods wereadded in Symfony 2.5.`
	`319`	+:method:`PropertyAccessor::isWritable<Symfony\\Component\\PropertyAccess\\PropertyAccessor::isWritable>`
	`320`	`+ methods wereintroduced in Symfony 2.5.`
`321`	`321`
`322`		-When you want to check whether:method:`PropertyAccessor::getValue<Symfony\\Component\\PropertyAccess\\PropertyAccessor::getValue>`
	`322`	`+When you want to check whether`
	`323`	+:method:`PropertyAccessor::getValue<Symfony\\Component\\PropertyAccess\\PropertyAccessor::getValue>`
`323`	`324`	`can safely be called without actually calling that method, you can use`
`324`	`325`	:method:`PropertyAccessor::isReadable<Symfony\\Component\\PropertyAccess\\PropertyAccessor::isReadable>`
`325`	`326`	`instead::`
`@@ -333,12 +334,11 @@ instead::`
`333`	`334`	The same is possible for:method:`PropertyAccessor::setValue<Symfony\\Component\\PropertyAccess\\PropertyAccessor::setValue>`:
`334`	`335`	`Call the`
`335`	`336`	:method:`PropertyAccessor::isWritable<Symfony\\Component\\PropertyAccess\\PropertyAccessor::isWritable>`
`336`		`-method to find out whether a property path can be updated. In the third`
`337`		`-argument, you should pass the value that you want to write::`
	`337`	`+method to find out whether a property path can be updated::`
`338`	`338`
`339`	`339`	`$person = new Person();`
`340`	`340`
`341`		`- if ($accessor->isWritable($person, 'firstName', 'Wouter') {`
	`341`	`+ if ($accessor->isWritable($person, 'firstName') {`
`342`	`342`	`// ...`
`343`	`343`	`}`
`344`	`344`

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