git-log: update examples (#4293)

pages/common/git-log.md

@@ -3,7 +3,7 @@
 > Show a history of commits.
 > More information: <https://git-scm.com/docs/git-log>.
 
-- Show the sequence of commits starting from the current one, in reverse chronological order:
+- Show the sequence of commits starting from the current one, in reverse chronological order of the git repository in the current working directory:
 
 `git log`
 
@@ -11,17 +11,13 @@
 
 `git log -p {{path/to/file_or_directory}}`
 
-- Show only the first line of each commit message:
-
-`git log --oneline`
-
 - Show an overview of which file(s) changed in each commit:
 
 `git log --stat`
 
-- Show a graph of commits in the current branch:
+- Show a graph of commits in the current branch using only the first line of each commit message:
 
-`git log --graph`
+`git log --oneline --graph`
 
 - Show a graph of all commits, tags and branches in the entire repo:
 
@@ -30,3 +26,11 @@
 - Show only commits whose messages include a given string (case-insensitively):
 
 `git log -i --grep {{search_string}}`
+
+- Show the last N commits from a certain author:
+
+`git log -n {{number}} --author={{author}}`
+
+- Show commits between two dates:
+
+`git log --before={{date}} --after={{date}}`