Fix typos in ImageView and SPIR-V documentation.

Author: zackwaters

scripts/core/EXT_Exp_ImageView.rst

@@ -15,7 +15,7 @@ from templates import helper as th
 =========================
 
 %if ver >= 1.5:
-This experimental extension is deprecated and replaced by the ${X}_extension_image_view standard extension.
+This experimental extension is deprecated and replaced by the ${x}_extension_image_view standard extension.
 %endif
 
 API

scripts/core/EXT_Exp_ImageViewPlanar.rst

@@ -15,7 +15,7 @@ from templates import helper as th
 =============================
 
 %if ver >= 1.5:
-This experimental extension is deprecated and replaced by the ${X}_extension_image_view_planar standard extension.
+This experimental extension is deprecated and replaced by the ${x}_extension_image_view_planar standard extension.
 %endif
 
 API

scripts/core/SPIRV.rst

@@ -414,7 +414,7 @@ Floating-Point Atomics
 ----------------------
 
 ${OneApi} Level-Zero API environments supporting the extension
-**${X}_extension_float_atomics** must support additional atomic instructions,
+**${x}_extension_float_atomics** must support additional atomic instructions,
 capabilities, and types.
 
 Atomic Load, Store, and Exchange