Update local.py docstrings (#13373)

* Update local.py

stride value implies the input argument of 'stride', and dilation_rate implies the input argument of 'dilation rate' of Conv1D function.
It is more explicit to express as code rather than using words stride value, dilation value.
Or, at least both stride and dilation_rate should be written in code, not only dilation rate as before document

* Update local.py

mark as code snippet

keras/layers/local.py

@@ -43,8 +43,8 @@ class LocallyConnected1D(Layer):
             specifying the length of the 1D convolution window.
         strides: An integer or tuple/list of a single integer,
             specifying the stride length of the convolution.
-            Specifying any stride value != 1 is incompatible with specifying
-            any `dilation_rate` value != 1.
+            Specifying any `strides!=1` is incompatible with specifying
+            any `dilation_rate!=1`.
         padding: Currently only supports `"valid"` (case-insensitive).
             `"same"` may be supported in the future.
         data_format: String, one of `channels_first`, `channels_last`.
@@ -250,9 +250,9 @@ class LocallyConnected2D(Layer):
 
     # Input shape
         4D tensor with shape:
-        `(samples, channels, rows, cols)` if data_format='channels_first'
+        `(samples, channels, rows, cols)` if `data_format='channels_first'`
         or 4D tensor with shape:
-        `(samples, rows, cols, channels)` if data_format='channels_last'.
+        `(samples, rows, cols, channels)` if `data_format='channels_last'`.
 
     # Output shape
         4D tensor with shape: