Fix typo in remove method template in entity generator

[benlumley]

Single character change - fixes generated docblocks for removeXXX methods.

Before:

/**
 * Remove measurements
 *
 * @param <variableType$measurements
 */
 public function removeMeasurement(\My\Bundle\Entity\CalibrationMeasurement $measurements)
 {
     $this->measurements->removeElement($measurements);
 }

After:

/**
 * Remove measurements
 *
 * @param My\Bundle\Entity\Measurement $measurements
 */
 public function removeMeasurement(\My\Bundle\Entity\Measurement $measurements)
 {
     $this->measurements->removeElement($measurements);
 }

[travisbot]

This pull request passes (merged c84607c into 5d2a3bc).

[stof]

@beberlei 👍 you forgot to backport this fix when backporting the commit from 2.3 to 2.2 a while ago as you picked only the original commit and not the fix