C63800: Changing bookmarks to hardcoded bookmarks

Hello @DennisLee-DennisLee, @corob-msft, @mikeblome, @Mikejo5000, @ghogen
Localization team has reported source content issue that causes localized version to have broken/different format compared to en-us version.
Description : Localization / Transformer unfriendly content. Bookmark containing underscore results in underscore being omitted after transformation. Please use hardcoded bookmark
Please review and merge the proposed file change to fix to target versions. If you make related fix in another PR  then share your PR number so we can confirm and close this PR.
Many thanks in advance.

Author: v-makoud

docs/parallel/openmp/4-environment-variables.md

@@ -25,7 +25,7 @@ ksh:
 DOS:  
 `set OMP_SCHEDULE="dynamic"`
 
-## 4.1 OMP_SCHEDULE
+## <a name="4.1-OMP_SCHEDULE"></a>4.1 OMP_SCHEDULE
 
 `OMP_SCHEDULE` applies only to `for` and `parallel for` directives that have the schedule type `runtime`. The schedule type and chunk size for all such loops can be set at run time. Set this environment variable to any recognized schedule type and to an optional *chunk_size*.
 
@@ -43,7 +43,7 @@ setenv OMP_SCHEDULE "dynamic"
 - [for](2-directives.md#241-for-construct) directive
 - [parallel for](2-directives.md#251-parallel-for-construct) directive
 
-## 4.2 OMP_NUM_THREADS
+## <a name="4.2-OMP_NUM_THREADS"></a>4.2 OMP_NUM_THREADS
 
 The `OMP_NUM_THREADS` environment variable sets the default number of threads to use during execution. `OMP_NUM_THREADS` is ignored if that number is explicitly changed by calling the `omp_set_num_threads` library routine. It's also ignored if there's an explicit `num_threads` clause on a `parallel` directive.
 
@@ -67,7 +67,7 @@ setenv OMP_NUM_THREADS 16
 - [omp_set_num_threads](3-run-time-library-functions.md#311-omp_set_num_threads-function) function
 - [omp_set_dynamic](3-run-time-library-functions.md#317-omp_set_dynamic-function) function
 
-## 4.3 OMP_DYNAMIC
+## <a name="4.3-OMP_DYNAMIC"></a>4.3 OMP_DYNAMIC
 
 The `OMP_DYNAMIC` environment variable enables or disables dynamic adjustment of the number of threads available for the execution of parallel regions. `OMP_DYNAMIC` is ignored when dynamic adjustment is explicitly enabled or disabled by calling the `omp_set_dynamic` library routine. Its value must be `TRUE` or `FALSE`.
 
@@ -84,7 +84,7 @@ setenv OMP_DYNAMIC TRUE
 - [Parallel regions](2-directives.md#23-parallel-construct)
 - [omp_set_dynamic](3-run-time-library-functions.md#317-omp_set_dynamic-function) function
 
-## 4.4 OMP_NESTED
+## <a name="4.4-OMP_NESTED"></a>4.4 OMP_NESTED
 
 The `OMP_NESTED` environment variable enables or disables nested parallelism unless nested parallelism is enabled or disabled by calling the `omp_set_nested` library routine. If `OMP_NESTED` is set to `TRUE`, nested parallelism is enabled. If `OMP_NESTED` is set to `FALSE`, nested parallelism is disabled. The default value is `FALSE`.