Corrected few grammar errors in documentation (#184)

* Corrected few erros in documenetation.

* Implemented the recomendations.

Author: rrohit2901

_docs/grader/grade_inquiry_grader.md

@@ -44,7 +44,7 @@ and [Enabling Grade Inquiries](../instructor/grade_inquiry_instructor).
 
 ### Reopening Grade Inquiries
 
-If a grade inquiry was prematurely closed or resolved the grader can reopen the grade inquiry by pressing the blue 'Reopen Grade Inquiry' button.
+If a grade inquiry was prematurely closed or resolved, the grader can reopen the grade inquiry by pressing the blue 'Reopen Grade Inquiry' button.
 
 ![](/images/grade_inquiry/instructor_reload_grade_inquiry.PNG)
 
@@ -60,7 +60,7 @@ person during office hours.
 
 ### Grade Inquiry Per Component
 
-If grade inquiry per component is enabled, grade inquiries can be made for a specific component. For example, assume there is a component of the gradeable named Read Me and a component named Documentation. Now two separate grade inquiries can be made for each of these components. The grader(s) who graded that component will get notified if they are a grader that can be shown.
+If grade inquiry per component is enabled, grade inquiries can be made for a specific component. For example, assume there is a component of the gradeable named README and a component named Documentation. Now two separate grade inquiries can be made for each of these components. The grader(s) who graded that component will get notified if they are a grader that can be shown.
 
 ![](/images/grade_inquiry/grader_grade_inquiry_per_component.PNG)
 

_docs/student/submission.md

@@ -39,7 +39,7 @@ Once you have selected all necessary files, press "Submit".
 Then wait patiently for your assignment to be graded.  The page will
 automatically refresh when grading is complete.  If the assignment is
 computationally intensive or if the server is busy grading your
-classmates work, you may need to wait longer.
+classmates' work, you may need to wait longer.
 
 
 ![](/images/Submission_Result_Buggy.png)

_docs/sysadmin/course_archiving.md

@@ -86,7 +86,7 @@ chmod ugo-w /var/local/submitty/courses/<SEMESTER>/<COURSE>
 ```
 
 Note that both of these changes can be nontrivial to revert (since the
-permissions and group ownership are nonuniform within the course
+permissions and group ownership are non-uniform within the course
 directory.
 
 _TODO: Add more instructions and notes as the procedure is developed._