Apply suggestions from code review

Co-authored-by: Nikola Forró <[email protected]>

Author: dcermak

specfile/changelog.py

@@ -35,9 +35,7 @@
     "Dec",
 )
 
-_OPENSUSE_CHANGELOG_SEPARATOR = (
-    "-------------------------------------------------------------------"
-)
+_OPENSUSE_CHANGELOG_SEPARATOR = 67 * "-"
 
 
 @unique
@@ -206,14 +204,15 @@ def assemble(
         Args:
             timestamp: Timestamp of the entry.
                 Supply `datetime` rather than `date` for extended format.
-                The hour is set to 12 for openSUSE style changelog entries, if a
-                date is passed instead of a datetime
+                openSUSE-style changelog entries mandate extended format, so if a `date`
+                is supplied, the timestamp will be set to noon of that day.
             author: Author of the entry.
             content: List of lines forming the content of the entry.
             evr: EVR (epoch, version, release) of the entry.
+                Ignored if `style` is `ChangelogStyle.openSUSE`.
             day_of_month_padding: Padding to apply to day of month in the timestamp.
             append_newline: Whether the entry should be followed by an empty line.
-            style: Which style of changelog should be created
+            style: Which style of changelog should be created.
 
         Returns:
             New instance of `ChangelogEntry` class.