ARC: pgalloc.h: delete a duplicated word + other fixes

Drop the repeated word "to".
Change "Thay" to "That".
Add a closing right parenthesis.
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Vineet Gupta <vgupta@synopsys.com>
Cc: linux-snps-arc@lists.infradead.org
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>

arch/arc/include/asm/pgalloc.h

@@ -18,10 +18,10 @@
  * vineetg: April 2010
  *  -Switched pgtable_t from being struct page * to unsigned long
  *      =Needed so that Page Table allocator (pte_alloc_one) is not forced to
- *       to deal with struct page. Thay way in future we can make it allocate
+ *       deal with struct page. That way in future we can make it allocate
  *       multiple PG Tbls in one Page Frame
  *      =sweet side effect is avoiding calls to ugly page_address( ) from the
- *       pg-tlb allocator sub-sys (pte_alloc_one, ptr_free, pmd_populate
+ *       pg-tlb allocator sub-sys (pte_alloc_one, ptr_free, pmd_populate)
  *
  *  Amit Bhor, Sameer Dhavale: Codito Technologies 2004
  */