minor symfony#26016 [Intl] Fixed the broken link (bocharsky-bw)

This PR was merged into the 2.7 branch.

Discussion
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[Intl] Fixed the broken link

| Q             | A
| ------------- | ---
| Branch?       | 2.7
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

From symfony/intl#6

Commits
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5733e02 [Intl] Fixed the broken link

Author: fabpot

src/Symfony/Component/Intl/README.md

@@ -5,7 +5,7 @@ A PHP replacement layer for the C intl extension that also provides access to
 the localization data of the ICU library.
 
 The replacement layer is limited to the locale "en". If you want to use other
-locales, you should [install the intl PHP extension] [0] instead.
+locales, you should [install the intl PHP extension][0] instead.
 
 Resources
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