Deleted duplicated paragraph (#902)

* Deleted duplicated paragraph

Deleted the duplicated paragraph "Committing Changes" (already in the paragraph "Staging and Committing Files") and changed "git add" to "git add -p". All accordingly to #888

* Corrected "git add -p"

Corrected a mistake with "git add -p" and added the normal "git add" command again

Co-authored-by: Ezio Melotti <ezio.melotti@gmail.com>

Co-authored-by: Ezio Melotti <ezio.melotti@gmail.com>

gitbootcamp.rst

@@ -194,7 +194,8 @@ Staging and Committing Files
 
 2. To stage the files to be included in your commit::
 
-      git add <filename1> <filename2>
+      git add -p  # to review and add changes to existing files
+      git add <filename1> <filename2>  # to add new files
 
 3. To commit the files that have been staged (done in step 2):
 
@@ -225,21 +226,6 @@ To re-apply the last stashed change::
 
    git stash pop
 
-.. _commit-changes:
-
-Committing Changes
-------------------
-
-Add the files you want to commit::
-
-   git add <filename>
-
-Commit the files:
-
-.. code-block:: bash
-
-   git commit -m "<message>"
-
 .. _diff-changes:
 
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