highbd_loopfilter_neon: correct fn case in comments

some instances of Filter* were missed during renaming

Bug: b/217462944
Change-Id: Ifead2b248fcf6692329de1f126a4d5f587f05f00
diff --git a/aom_dsp/arm/highbd_loopfilter_neon.c b/aom_dsp/arm/highbd_loopfilter_neon.c
index 7d62515..0b720ce 100644
--- a/aom_dsp/arm/highbd_loopfilter_neon.c
+++ b/aom_dsp/arm/highbd_loopfilter_neon.c
@@ -90,7 +90,7 @@
 }
 
 // -----------------------------------------------------------------------------
-// FilterNMasks functions.
+// filterN_masks functions.
 
 static INLINE void filter4_masks(const uint16x8_t p0q0, const uint16x8_t p1q1,
                                  const uint16_t hev_thresh,
@@ -99,13 +99,13 @@
                                  uint16x4_t *const hev_mask,
                                  uint16x4_t *const needs_filter4_mask) {
   const uint16x8_t p0p1_q0q1 = vabdq_u16(p0q0, p1q1);
-  // This includes cases where needs_filter4() is not true and so Filter2() will
+  // This includes cases where needs_filter4() is not true and so filter2() will
   // not be applied.
   const uint16x4_t hev_tmp_mask = hev(p0p1_q0q1, hev_thresh);
 
   *needs_filter4_mask = needs_filter4(p0p1_q0q1, inner_thresh, outer_mask);
 
-  // Filter2() will only be applied if both needs_filter4() and hev() are true.
+  // filter2() will only be applied if both needs_filter4() and hev() are true.
   *hev_mask = vand_u16(hev_tmp_mask, *needs_filter4_mask);
 }
 
@@ -172,9 +172,9 @@
 }
 
 // -----------------------------------------------------------------------------
-// FilterN functions.
+// filterN functions.
 
-// Calculate filter4() or Filter2() based on |hev_mask|.
+// Calculate filter4() or filter2() based on |hev_mask|.
 static INLINE void filter4(const uint16x8_t p0q0, const uint16x8_t p0q1,
                            const uint16x8_t p1q1, const uint16x4_t hev_mask,
                            int bitdepth, uint16x8_t *const p1q1_result,
@@ -185,7 +185,7 @@
   const int16x8_t q0mp0_p1mq1 = vreinterpretq_s16_u16(vsubq_u16(q0p1, p0q1));
   const int16x4_t q0mp0_3 = vmul_n_s16(vget_low_s16(q0mp0_p1mq1), 3);
 
-  // If this is for Filter2() then include |p1mq1|. Otherwise zero it.
+  // If this is for filter2() then include |p1mq1|. Otherwise zero it.
   const int16x4_t min_signed_pixel = vdup_n_s16(-(1 << (bitdepth - 1)));
   const int16x4_t max_signed_pixel = vdup_n_s16((1 << (bitdepth - 1)) - 1);
   const int16x4_t p1mq1 = vget_high_s16(q0mp0_p1mq1);