drm/i915/doc: Escape wildcard in method names

Stephen Rothwell reported htmldocs warnings:

Documentation/gpu/i915:64: drivers/gpu/drm/i915/gt/intel_workarounds.c:32: WARNING: Inline emphasis start-string without end-string.
Documentation/gpu/i915:64: drivers/gpu/drm/i915/gt/intel_workarounds.c:57: WARNING: Inline emphasis start-string without end-string.
Documentation/gpu/i915:64: drivers/gpu/drm/i915/gt/intel_workarounds.c:66: WARNING: Inline emphasis start-string without end-string.

Escape wildcards in *_ctx_workarounds_init(), *_gt_workarounds_init(), and
*_whitelist_build() to fix above warnings.

Link: https://lore.kernel.org/linux-next/20230203134622.0b6315b9@canb.auug.org.au/
Fixes: 0c3064cf ("drm/i915/doc: Document where to implement register workarounds")
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Bagas Sanjaya <bagasdotme@gmail.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230203100215.31852-2-bagasdotme@gmail.com

drivers/gpu/drm/i915/gt/intel_workarounds.c

@@ -30,7 +30,7 @@
  *   creation to have a "primed golden context", i.e. a context image that
  *   already contains the changes needed to all the registers.
  *
- *   Context workarounds should be implemented in the *_ctx_workarounds_init()
+ *   Context workarounds should be implemented in the \*_ctx_workarounds_init()
  *   variants respective to the targeted platforms.
  *
  * - Engine workarounds: the list of these WAs is applied whenever the specific
@@ -55,7 +55,7 @@
  * - GT workarounds: the list of these WAs is applied whenever these registers
  *   revert to their default values: on GPU reset, suspend/resume [1]_, etc.
  *
- *   GT workarounds should be implemented in the *_gt_workarounds_init()
+ *   GT workarounds should be implemented in the \*_gt_workarounds_init()
  *   variants respective to the targeted platforms.
  *
  * - Register whitelist: some workarounds need to be implemented in userspace,
@@ -64,7 +64,7 @@
  *   this is just a special case of a MMIO workaround (as we write the list of
  *   these to/be-whitelisted registers to some special HW registers).
  *
- *   Register whitelisting should be done in the *_whitelist_build() variants
+ *   Register whitelisting should be done in the \*_whitelist_build() variants
  *   respective to the targeted platforms.
  *
  * - Workaround batchbuffers: buffers that get executed automatically by the