Fix spelling/wording issues

Found by using:
    codespell --builtin clear,rare,usage,informal,code,names

Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>

README.md

@@ -6,7 +6,7 @@ Xorg mailing list:
 
   https://lists.x.org/mailman/listinfo/xorg
 
-The master development code repository can be found at:
+The primary development code repository can be found at:
 
   https://gitlab.freedesktop.org/xorg/driver/xf86-video-tdfx
 

src/tdfx.h

@@ -37,7 +37,7 @@
 #define TDFX_MINOR_VERSION PACKAGE_VERSION_MINOR
 #define TDFX_PATCHLEVEL PACKAGE_VERSION_PATCHLEVEL
 
-/* Macros to aid source compatibilty between pci-rework and "classic" builds.
+/* Macros to aid source compatibility between pci-rework and "classic" builds.
  */
 #ifdef XSERVER_LIBPCIACCESS
 #include <pciaccess.h>

src/tdfx_driver.c

@@ -2419,7 +2419,7 @@ TDFXScreenInit(SCREEN_INIT_ARGS_DECL) {
   pScreen->BlockHandler = TDFXBlockHandler;
 
   /*
-   * DRICloseScreen isn't called thru a wrapper but explicitely
+   * DRICloseScreen isn't called thru a wrapper but explicitly
    * in of TDFXCloseScreen() before the rest is unwrapped
    */
   

src/tdfx_sli.c

@@ -249,7 +249,7 @@ Bool TDFXSetupSLI(ScrnInfoPtr pScrn, Bool sliEnable, int aaSamples)
     else dwFormat = CFG_AA_LFB_RD_FORMAT_32BPP;
     if (pTDFX->numChips==2 && !sliEnable && aaSamples==2)
       dwFormat|=CFG_AA_LFB_RD_DIVIDE_BY_4;
-    /* Thess are wrong, because we don't know where the secondary buffers
+    /* These are wrong, because we don't know where the secondary buffers
        are located */
     pTDFX->writeChipLong(pTDFX, i, CFG_AA_LFB_CTRL, 
 			 (pScrn->videoRam<<10 /* 2nd buf */ << CFG_AA_BASEADDR_SHIFT) |

src/tdfx_video.c

@@ -528,7 +528,7 @@ TDFXScreenToScreenYUVStretchBlit (ScrnInfoPtr pScrn,
                                   short dst_x2, short dst_y2)
 {
    TDFXPtr pTDFX = TDFXPTR(pScrn);
-   /* reformulate the paramaters the way the hardware wants them */
+   /* reformulate the parameters the way the hardware wants them */
    INT32 src_x = src_x1 & 0x1FFF;
    INT32 src_y = src_y1 & 0x1FFF;
    INT32 dst_x = dst_x1 & 0x1FFF;