chore(style): remove the trailing space from all source files (#3188)

Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>

docs/conf.py

@@ -49,7 +49,7 @@ extensions = ['sphinx.ext.autodoc',
 # Add any paths that contain templates here, relative to this directory.
 templates_path = ['_templates']
 
-# The default language to highlight source code in. The default is 'python'. 
+# The default language to highlight source code in. The default is 'python'.
 # The value should be a valid Pygments lexer name, see Showing code examples for more details.
 
 
@@ -88,7 +88,7 @@ language = None
 # List of patterns, relative to source directory, that match files and
 # directories to ignore when looking for source files.
 # This patterns also effect to html_static_path and html_extra_path
-exclude_patterns = ['_build', 'doxygen_html', 'Thumbs.db', '.DS_Store', 
+exclude_patterns = ['_build', 'doxygen_html', 'Thumbs.db', '.DS_Store',
                     'README.md', 'lv_examples', 'out_html' ]
 
 # The name of the Pygments (syntax highlighting) style to use.
@@ -164,7 +164,7 @@ latex_elements = {
     # Latex figure (float) alignment
     #
     # 'figure_align': 'htbp',
-    
+
     'inputenc': '',
     'utf8extra': '',
     'classoptions': ',openany,oneside',