Add a few missing docstrings

Author: cirras

src/eolib/data/eo_writer.py

@@ -4,7 +4,14 @@
 
 
 class EoWriter:
+    """
+    A class for writing EO data to a sequence of bytes.
+    """
+
     def __init__(self):
+        """
+        Creates a new ``EoWriter`` with no data.
+        """
         self.data = bytearray()
         self._string_sanitization_mode = False
 

src/eolib/packet/sequence_start.py

@@ -29,9 +29,19 @@ def zero() -> 'SequenceStart':
 
 
 class SimpleSequenceStart(SequenceStart):
+    """
+    A simple ``SequenceStart`` implementation backed by a single integer value.
+    """
+
     _value: int
 
     def __init__(self, value: int):
+        """
+        Creates a ``SimpleSequenceStart`` from an integer value.
+
+        Args:
+            value (int): The sequence start value.
+        """
         self._value = value
 
     @property

src/eolib/protocol/protocol_enum_meta.py

@@ -2,6 +2,10 @@
 
 
 class ProtocolEnumMeta(EnumMeta):
+    """
+    Enum metaclass that preserves unrecognized values as synthetic enum members.
+    """
+
     def __call__(cls, value, names=None, *, module=None, qualname=None, type=None, start=1):
         if names is not None:
             return super().__call__(