Cleanup: Fix typos in source/blender/blenlib

Fixes some user-facing and non-user-facing typos. Found via codespell.

Pull Request: https://projects.blender.org/blender/blender/pulls/146111

source/blender/blenlib/BLI_math_matrix.hh

@@ -1808,7 +1808,7 @@ extern template float4x4 perspective(
 
 /**
  * Transform normal vectors, maintaining their unit length status, but implementing some
- * optimizations for identity matrics and uniform scaling.
+ * optimizations for identity matrix and uniform scaling.
  */
 void transform_normals(const float3x3 &transform, MutableSpan<float3> normals);
 void transform_normals(Span<float3> src, const float3x3 &transform, MutableSpan<float3> dst);

source/blender/blenlib/BLI_subprocess.hh

@@ -56,7 +56,7 @@ class BlenderSubprocess : NonCopyable {
   /**
    * Create a subprocess and pass the arguments to the main function.
    * NOTE: The subprocess path is not passed as `argv[0]`.
-   * `args` only support alpha-numeric characters, underscores and hyphen-minus as a safety
+   * `args` only support alphanumeric characters, underscores and hyphen-minus as a safety
    * measure.
    * WARNING: This function shouldn't be called again after it succeeds.
    */

source/blender/blenlib/intern/offset_indices.cc

@@ -29,7 +29,7 @@ OffsetIndices<int> accumulate_counts_to_offsets(MutableSpan<int> counts_to_offse
   }
   counts_to_offsets.last() = offset;
 
-  BLI_assert_msg(offset == offset_i64, "Integer overflow occured");
+  BLI_assert_msg(offset == offset_i64, "Integer overflow occurred");
   UNUSED_VARS_NDEBUG(offset_i64);
 
   return OffsetIndices<int>(counts_to_offsets);