fix spelling

tools/quake3/common/unzip.cpp

@@ -1237,7 +1237,7 @@ static void  zcfree  OF((voidp opaque, voidp ptr));
 /* ===========================================================================
      Read a byte from a gz_stream; update next_in and avail_in. Return EOF
    for end of file.
-   IN assertion: the stream s has been sucessfully opened for reading.
+   IN assertion: the stream s has been successfully opened for reading.
 */
 
 /*
@@ -1369,8 +1369,8 @@ static int strcmpcasenosensitive_internal (const char* fileName1,const char* fil
 
 /*
    Compare two filename (fileName1,fileName2).
-   If iCaseSenisivity = 1, comparision is case sensitivity (like strcmp)
-   If iCaseSenisivity = 2, comparision is not case sensitivity (like strcmpi
+   If iCaseSenisivity = 1, comparison is case sensitivity (like strcmp)
+   If iCaseSenisivity = 2, comparison is not case sensitivity (like strcmpi
                                                                 or strcasecmp)
    If iCaseSenisivity = 0, case sensitivity is defaut of your operating system
         (like 1 on Unix, 2 on Windows)
@@ -2788,7 +2788,7 @@ extern int inflate_flush OF((
       end-of-block.  Note however that the static length tree defines
       288 codes just to fill out the Huffman codes.  Codes 286 and 287
       cannot be used though, since there is no length base or extra bits
-      defined for them.  Similarily, there are up to 30 distance codes.
+      defined for them.  Similarly, there are up to 30 distance codes.
       However, static trees define 32 codes (all 5 bits) to fill out the
       Huffman codes, but the last two had better not show up in the data.
    7. Unzip can check dynamic Huffman blocks for complete code sets.