changed batch to bulk (#456)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

## Documentation
- Updated instructor setup course documentation across three
features—Assessment Updates, Groups Upload, and Student Tagging—with
refined terminology and more comprehensive descriptions to improve
clarity and consistency.
- Improved procedural guidance with clarified instructional steps and
updated image descriptions to provide better support for users working
with bulk upload workflows and configurations.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Author: LolaValente

source/instructors/setupcourses/batch-assessment-update.rst

@@ -5,7 +5,7 @@
 .. _batch-assessment-update:
 
 
-Batch Assessment Update
+Bulk Assessment Update
 =======================
 
 You can bulk update many assessment settings, including points, partial points, use of maximum score, show expected answer, number of attempts, and showing rationale to students.
@@ -79,7 +79,7 @@ To bulk update the assessment settings, follow these steps:
 5. Select the assignments you want to modify.
 
    .. image:: /img/guides/select-excel-batch-update.png
-      :alt: Select excel Batch Update
+      :alt: Select excel Bulk Update
 
 6. Click **Apply and Close**. A popup window will appear asking you to confirm, click **Yes**.
 

source/instructors/setupcourses/batch-groups-upload.rst

@@ -4,7 +4,7 @@
 
 .. _batch-groups-upload:
 
-Batch Groups Upload
+Bulk Groups Upload
 ===================
 
 You can organize student groups in bulk using a CSV file for assignments where you have enabled :ref:`Pair Programming <group-work>`. 
@@ -18,7 +18,7 @@ To upload the groups, follow these steps:
 3. Select the CSV file in which you have defined all the groups details and press **Upload groups** button
 
    .. image:: /img/batch-groups-upload.png
-      :alt: Select csv to batch upload the student groups
+      :alt: Select csv to bulk upload the student groups
 
 
 You can download a csv template file from the **Download Template** setting in the **Group Settings** area. Update the fields as needed and use that csv file to upload student groups.

source/instructors/setupcourses/batch-student-tagging.rst

@@ -4,7 +4,7 @@
 
 .. _batch-student-tagging:
 
-Batch Student Tagging
+Bulk Student Tagging
 =====================
 
 You can easily assign tags to all or multiple students at once using a CSV file. Once the tags are assigned, you can search and filter students based on those tags in the search bar. This is a useful feature when you want to :ref:`view the work <viewing-student-work>` of specific students.