Fix typos and grammar errors in comments and docstrings (#181989)

Summary:
Correct minor typos across several files: wrong pronouns ("it" vs
"if"), subject-verb agreement ("functions" vs "function", "methods"
vs "method"), redundant words ("are is"), and plural consistency
("these cases", "these values").

Authored with Claude (typo_terminator2).

X-link: pytorch/pytorch#181989
Approved by: https://github.com/Lucaskabela

Reviewed By: wdvr

Differential Revision: D103613749

fbshipit-source-id: 91ced6d4891e5692af650677e4eb9e77f311a3ca

Author: frgossen

userbenchmark/dynamo/dynamobench/_dynamo/utils.py

@@ -3479,8 +3479,8 @@ def to_tensor(t: Any) -> torch.Tensor:
 
                 def get_multiplier() -> float:
                     # In some particular cases, we expect high difference in results.
-                    # At the moment one of this cases is inductor freezing bfloat16 convolution const folding.
-                    # In case of it the res_error is at least one order of magnitude higher.
+                    # At the moment one of these cases is inductor freezing bfloat16 convolution const folding.
+                    # In this case, the res_error is at least one order of magnitude higher.
                     if force_max_multiplier:
                         return 10.0
                     # In the case of using AMP (Automatic Mixed Precision), certain models have