Fix up missing/inaccurate plugin description strings.

volatility/framework/plugins/windows/strings.py

@@ -16,6 +16,7 @@ vollog = logging.getLogger(__name__)
 
 
 class Strings(interfaces.plugins.PluginInterface):
+    """Reads output from the strings command and indicates which process(es) each string belongs to."""
 
     @classmethod
     def get_requirements(cls) -> List[interfaces.configuration.RequirementInterface]:

volatility/framework/plugins/windows/vadyarascan.py

@@ -21,6 +21,7 @@ except ImportError:
 
 
 class VadYaraScan(interfaces.plugins.PluginInterface):
+    """Scans all the Virtual Address Descriptor memory maps using yara."""
     _version = (1, 0, 0)
 
     @classmethod

volatility/framework/plugins/yarascan.py

@@ -34,8 +34,7 @@ class YaraScanner(interfaces.layers.ScannerInterface):
 
 
 class YaraScan(plugins.PluginInterface):
-    """Runs all relevant plugins that provide time related information and
-    orders the results by time."""
+    """Scans memory using yara rules (string or file)."""
 
     @classmethod
     def get_requirements(cls) -> List[interfaces.configuration.RequirementInterface]: