Improve doc blocks in cache drivers

src/Core/Cache/MemcachedCacheDriver.php

@@ -53,6 +53,9 @@ class MemcachedCacheDriver extends AbstractCacheDriver implements IMemoryCacheDr
 		}
 	}
 
+	/**
+	 * (@inheritdoc)
+	 */
 	public function get($key)
 	{
 		$return = null;
@@ -68,6 +71,9 @@ class MemcachedCacheDriver extends AbstractCacheDriver implements IMemoryCacheDr
 		return $return;
 	}
 
+	/**
+	 * (@inheritdoc)
+	 */
 	public function set($key, $value, $ttl = Cache::FIVE_MINUTES)
 	{
 		$cachekey = $this->getCacheKey($key);
@@ -88,12 +94,18 @@ class MemcachedCacheDriver extends AbstractCacheDriver implements IMemoryCacheDr
 
 	}
 
+	/**
+	 * (@inheritdoc)
+	 */
 	public function delete($key)
 	{
 		$cachekey = $this->getCacheKey($key);
 		return $this->memcached->delete($cachekey);
 	}
 
+	/**
+	 * (@inheritdoc)
+	 */
 	public function clear($outdated = true)
 	{
 		if ($outdated) {
@@ -104,12 +116,7 @@ class MemcachedCacheDriver extends AbstractCacheDriver implements IMemoryCacheDr
 	}
 
 	/**
-	 * @brief Sets a value if it's not already stored
-	 *
-	 * @param string $key      The cache key
-	 * @param mixed  $value    The old value we know from the cache
-	 * @param int    $ttl      The cache lifespan, must be one of the Cache constants
-	 * @return bool
+	 * (@inheritdoc)
 	 */
 	public function add($key, $value, $ttl = Cache::FIVE_MINUTES)
 	{