Remove unnecessary space in between

docs/DeveloperGuide.md

@@ -849,29 +849,24 @@ testers are expected to do more *exploratory* testing.
 1. Filtering out a group of students based on the keyword/s given
 
    1. Test case: `filter x primary`<br>
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    Expected: All students that has `primary` tag will be filtered out.
 
    2. Test case: `filter x primary secondary`<br>
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    Expected: All students that has `primary` or `secondary` or both tag will be filtered out.
 
    3. Test case: Other incorrect check commands to try:`filter`, `filter x`, `...`
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    Expected: The student list will not be filtered. Error details shown in the status message.
 
 ### Switching between score text panel and score chart panel
 
 1. Switching between score text panel and score chart panel using CLI
 
    1. Test case: `switch`<br>
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    Expected: The panel will be switched.
 
 2. Switching between score text panel and score chart panel through mouse click
 
    1. Test case: Click on either the "text" or "chart" tab under score list<br>
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    Expected: The panel will be switched.
 
 ### Saving data