docs: i2c: i2c-protocol: use same wording as smbus-protocol

In smbus-protocol.rst we use the text "Implemented by" for the same meaning
as "This corresponds to". Change everything to "Implemented by" for
coherency.
Signed-off-by: Luca Ceresoli <luca@lucaceresoli.net>
Reported-by: Jean Delvare <jdelvare@suse.de>
Reviewed-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

Documentation/i2c/i2c-protocol.rst

@@ -28,7 +28,7 @@ Count (8 bits)  A data byte containing the length of a block operation.
 Simple send transaction
 =======================
 
-This corresponds to i2c_master_send()::
+Implemented by i2c_master_send()::
 
   S Addr Wr [A] Data [A] Data [A] ... [A] Data [A] P
 
@@ -36,7 +36,7 @@ This corresponds to i2c_master_send()::
 Simple receive transaction
 ==========================
 
-This corresponds to i2c_master_recv()::
+Implemented by i2c_master_recv()::
 
   S Addr Rd [A] [Data] A [Data] A ... A [Data] NA P
 
@@ -44,7 +44,7 @@ This corresponds to i2c_master_recv()::
 Combined transactions
 =====================
 
-This corresponds to i2c_transfer().
+Implemented by i2c_transfer().
 
 They are just like the above transactions, but instead of a stop
 condition P a start condition S is sent and the transaction continues.