Fix typos in exp-based microkernels and evaluation stubs

PiperOrigin-RevId: 343452021
diff --git a/src/math/expminus-neonfma-lut64-p2.c b/src/math/expminus-neonfma-lut64-p2.c
index f666610..5443778 100644
--- a/src/math/expminus-neonfma-lut64-p2.c
+++ b/src/math/expminus-neonfma-lut64-p2.c
@@ -77,7 +77,7 @@
     float32x4_t vt = vfmaq_f32(vx, vn, vminus_ln2_o64_hi);
     vt = vfmaq_f32(vt, vn, vminus_ln2_o64_lo);
 
-    // Compute degree-2 polynomial approxiatmion for exp(t) on [-log(2)/128, log(2)/128].
+    // Compute degree-2 polynomial approximation for exp(t) on [-log(2)/128, log(2)/128].
     float32x4_t vp = vmulq_f32(vt, vc2);
     vp = vfmaq_f32(vt, vt, vp);