Apply suggestions from code review

Co-authored-by: Daniel D. Beck <[email protected]>

Author: hamishwillee

api/SubtleCrypto.json

@@ -1203,7 +1203,7 @@
           },
           "compressed_elliptic_curve_points": {
             "__compat": {
-              "description": "Key data can contain compressed elliptic curve points.",
+              "description": "Key data can contain compressed elliptic curve points",
               "spec_url": "https://w3c.github.io/webcrypto/#ecdsa-operations-import-key",
               "support": {
                 "chrome": {
@@ -1285,7 +1285,7 @@
           },
           "compressed_elliptic_curve_points": {
             "__compat": {
-              "description": "Key data can contain compressed elliptic curve points.",
+              "description": "Key data can contain compressed elliptic curve points",
               "spec_url": "https://w3c.github.io/webcrypto/#ecdsa-operations-import-key",
               "support": {
                 "chrome": {