cp: clarify and condense similar examples (#2926)

pages/common/cp.md

@@ -10,7 +10,7 @@
 
 `cp {{path/to/file.ext}} {{path/to/target_parent_directory}}`
 
-- Copy a directory recursively to another location:
+- Recursively copy a directory's contents to another location (if the destination exists, the directory is copied inside it):
 
 `cp -r {{path/to/directory}} {{path/to/copy}}`
 
@@ -18,10 +18,6 @@
 
 `cp -vr {{path/to/directory}} {{path/to/copy}}`
 
-- Copy the contents of a directory into another directory:
-
-`cp -r {{path/to/source_directory/*}} {{path/to/target_directory}}`
-
 - Copy text files to another location, in interactive mode (prompts user before overwriting):
 
 `cp -i {{*.txt}} {{path/to/target_directory}}`