style(doc comments): Remove comments talking about PHP version 5 (#2822279 by chipway)

coder_sniffer/Drupal/Sniffs/Array/ArraySniff.php

...fer/Drupal/Sniffs/CSS/ClassDefinitionNameSpacingSniff.php

coder_sniffer/Drupal/Sniffs/CSS/ColourDefinitionSniff.php

...niffer/Drupal/Sniffs/Classes/ClassCreateInstanceSniff.php

...r_sniffer/Drupal/Sniffs/Classes/ClassDeclarationSniff.php

...er/Drupal/Sniffs/Classes/FullyQualifiedNamespaceSniff.php

coder_sniffer/Drupal/Sniffs/Classes/InterfaceNameSniff.php

...sniffer/Drupal/Sniffs/Classes/UnusedUseStatementSniff.php

coder_sniffer/Drupal/Sniffs/Commenting/ClassCommentSniff.php

coder_sniffer/Drupal/Sniffs/Commenting/DocCommentSniff.php

..._sniffer/Drupal/Sniffs/Commenting/DocCommentStarSniff.php

coder_sniffer/Drupal/Sniffs/Commenting/FileCommentSniff.php

...sniffer/Drupal/Sniffs/Commenting/FunctionCommentSniff.php

coder_sniffer/Drupal/Sniffs/Commenting/HookCommentSniff.php

...r_sniffer/Drupal/Sniffs/Commenting/InlineCommentSniff.php

...Drupal/Sniffs/ControlStructures/ControlSignatureSniff.php

...r_sniffer/Drupal/Sniffs/ControlStructures/ElseIfSniff.php

.../Sniffs/ControlStructures/InlineControlStructureSniff.php

coder_sniffer/Drupal/Sniffs/Files/EndFileNewlineSniff.php

coder_sniffer/Drupal/Sniffs/Files/FileEncodingSniff.php