Fix some typos (#7320)

Zend/tests/array_unpack/undef_var.phpt

@@ -1,5 +1,5 @@
 --TEST--
-array unpacking with undefinded variable
+array unpacking with undefined variable
 --FILE--
 <?php
 

Zend/tests/generators/unused_return_value.phpt

@@ -1,5 +1,5 @@
 --TEST--
-There shouldn't be any leaks when the genertor's return value isn't used
+There shouldn't be any leaks when the generator's return value isn't used
 --FILE--
 <?php
 

Zend/tests/traits/property007.phpt

@@ -12,7 +12,7 @@ trait THello1 {
 }
 
 // Protected and public are handle more strict with a warning then what is
-// expected from normal inheritance since they can have easier coliding semantics
+// expected from normal inheritance since they can have easier colliding semantics
 echo "PRE-CLASS-GUARD\n";
 class SameNameInSubClassProducesNotice extends Base {
     use THello1;

Zend/tests/traits/trait_constant_001.phpt

@@ -1,5 +1,5 @@
 --TEST--
-__TRAIT__: Basics, a constant denoiting the trait of definition.
+__TRAIT__: Basics, a constant denoting the trait of definition.
 --FILE--
 <?php
 

Zend/tests/unset_cv11.phpt

@@ -1,5 +1,5 @@
 --TEST--
-unset() CV 11 (unset() of copy destoies original value)
+unset() CV 11 (unset() of copy destroys original value)
 --FILE--
 <?php
 $x = array("default"=>"ok");

Zend/zend_gc.c

@@ -33,7 +33,7 @@
  * ------------------------------------------
  *
  * GREEN - Acyclic
- * RED   - Candidate cycle underogin
+ * RED   - Candidate cycle undergoing
  * ORANGE - Candidate cycle awaiting epoch boundary.
  *
  *