diff --git a/sphinx/config.py b/sphinx/config.py
index 553aa74d6..b9f29668e 100644
--- a/sphinx/config.py
+++ b/sphinx/config.py
@@ -56,7 +56,7 @@ def is_serializable(obj: Any) -> bool:
 
 
 class ENUM:
-    """represents the config value should be a one of candidates.
+    """Represents the candidates which a config value should be one of.
 
     Example:
         app.add_config_value('latex_show_urls', 'no', None, ENUM('no', 'footnote', 'inline'))
@@ -215,7 +215,7 @@ class Config:
 
     def pre_init_values(self) -> None:
         """
-        Initialize some limited config variables before initialize i18n and loading extensions
+        Initialize some limited config variables before initializing i18n and loading extensions
         """
         variables = ['needs_sphinx', 'suppress_warnings', 'language', 'locale_dirs']
         for name in variables:
@@ -343,7 +343,7 @@ def eval_config_file(filename: str, tags: Optional[Tags]) -> Dict[str, Any]:
 
 
 def convert_source_suffix(app: "Sphinx", config: Config) -> None:
-    """This converts old styled source_suffix to new styled one.
+    """Convert old styled source_suffix to new styled one.
 
     * old style: str or list
     * new style: a dict which maps from fileext to filetype
@@ -371,7 +371,7 @@ def convert_highlight_options(app: "Sphinx", config: Config) -> None:
     """Convert old styled highlight_options to new styled one.
 
     * old style: options
-    * new style: dict that maps language names to options
+    * new style: a dict which maps from language name to options
     """
     options = config.highlight_options
     if options and not all(isinstance(v, dict) for v in options.values()):
@@ -392,7 +392,7 @@ def init_numfig_format(app: "Sphinx", config: Config) -> None:
 
 
 def correct_copyright_year(app: "Sphinx", config: Config) -> None:
-    """correct values of copyright year that are not coherent with
+    """Correct values of copyright year that are not coherent with
     the SOURCE_DATE_EPOCH environment variable (if set)
 
     See https://reproducible-builds.org/specs/source-date-epoch/
@@ -405,7 +405,7 @@ def correct_copyright_year(app: "Sphinx", config: Config) -> None:
 
 
 def check_confval_types(app: "Sphinx", config: Config) -> None:
-    """check all values for deviation from the default value's type, since
+    """Check all values for deviation from the default value's type, since
     that can result in TypeErrors all over the place NB.
     """
     for confval in config:
@@ -469,7 +469,7 @@ def check_primary_domain(app: "Sphinx", config: Config) -> None:
 def check_root_doc(app: "Sphinx", env: "BuildEnvironment", added: Set[str],
                    changed: Set[str], removed: Set[str]) -> Set[str]:
     """Adjust root_doc to 'contents' to support an old project which does not have
-    no root_doc setting.
+    any root_doc setting.
     """
     if (app.config.root_doc == 'index' and
             'index' not in app.project.docnames and