Improve multi-channel colorbar info and fix dataclass docstrings

- Change 5+ channel colorbar message to logger.info on auto mode only
  (explicit colorbar=True is not blocked)
- Fix double periods in dataclass docstrings

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: timtreis

src/spatialdata_plot/pl/render.py

@@ -1305,11 +1305,11 @@ def _render_images(
 
     # 2) Image has any number of channels but 1
     else:
-        if n_channels >= 5 and render_params.colorbar is True:
-            logger.warning(
-                "Colorbars are not supported for multi-channel images with 5+ channels. "
-                "To view individual channel scales, render channels separately with "
-                "`channel=<name>` and `colorbar=True`."
+        if n_channels >= 5 and render_params.colorbar == "auto":
+            logger.info(
+                "Colorbars are not shown by default for images with 5+ channels. "
+                "To show individual channel colorbars, render channels separately "
+                "with `channel=<name>` and `colorbar=True`."
             )
         layers = {}
         for ch_idx, ch in enumerate(channels):

src/spatialdata_plot/pl/render_params.py

@@ -214,7 +214,7 @@ class ScalebarParams:
 
 @dataclass
 class ShapesRenderParams:
-    """Shapes render parameters.."""
+    """Shapes render parameters."""
 
     cmap_params: CmapParams
     outline_params: OutlineParams
@@ -239,7 +239,7 @@ class ShapesRenderParams:
 
 @dataclass
 class PointsRenderParams:
-    """Points render parameters.."""
+    """Points render parameters."""
 
     cmap_params: CmapParams
     element: str
@@ -261,7 +261,7 @@ class PointsRenderParams:
 
 @dataclass
 class ImageRenderParams:
-    """Image render parameters.."""
+    """Image render parameters."""
 
     cmap_params: list[CmapParams] | CmapParams
     element: str
@@ -278,7 +278,7 @@ class ImageRenderParams:
 
 @dataclass
 class LabelsRenderParams:
-    """Labels render parameters.."""
+    """Labels render parameters."""
 
     cmap_params: CmapParams
     element: str