Remove access keyword from examples

[blegat]

Now that #264 is merged and released as part of 0.10.2, the examples need to be updated

[maleadt]

LGTM. We could still support this for SVM-backed allocations, but I don't see this in the USM spec (only the sycl_ext_oneapi_usm_device_read_only extension).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.12%. Comparing base (bd6c0c5) to head (1401884).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #288      +/-   ##
==========================================
+ Coverage   71.47%   73.12%   +1.65%     
==========================================
  Files          12       12              
  Lines         610      614       +4     
==========================================
+ Hits          436      449      +13     
+ Misses        174      165       -9     

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