BUG/MINOR: sample: Rename SenderComID/TargetComID to SenderCompID/TargetCompID

The recently introduced Financial Information eXchange (FIX)
converters have some hard coded tags based on the specification that
were misspelled. Specifically, SenderComID and TargetComID should
be SenderCompID and TargetCompID according to the specification [1][2].

This patch updates all references, which includes the converters
themselves, the regression test, and the documentation.

[1] https://fiximate.fixtrading.org/en/FIX.5.0SP2_EP264/tag49.html
[2] https://fiximate.fixtrading.org/en/FIX.5.0SP2_EP264/tag56.html
diff --git a/reg-tests/converter/fix.vtc b/reg-tests/converter/fix.vtc
index 8bddc4d..f035445 100644
--- a/reg-tests/converter/fix.vtc
+++ b/reg-tests/converter/fix.vtc
@@ -73,8 +73,8 @@
         tcp-request content set-var(req.fix_vsn)    req.payload(0,0),fix_tag_value(BeginString)
         tcp-request content set-var(req.fix_len)    req.payload(0,0),fix_tag_value(BodyLength)
         tcp-request content set-var(req.fix_type)   req.payload(0,0),fix_tag_value(MsgType)
-        tcp-request content set-var(req.fix_sender) req.payload(0,0),fix_tag_value(SenderComID)
-        tcp-request content set-var(req.fix_target) req.payload(0,0),fix_tag_value(TargetComID)
+        tcp-request content set-var(req.fix_sender) req.payload(0,0),fix_tag_value(SenderCompID)
+        tcp-request content set-var(req.fix_target) req.payload(0,0),fix_tag_value(TargetCompID)
         tcp-request content set-var(req.fix_chksum) req.payload(0,0),fix_tag_value(CheckSum)
         tcp-request content reject if ! { var(req.fix_vsn) "FIX.4.4" } || ! { var(req.fix_len) "102" }
         tcp-request content reject if ! { var(req.fix_type) "A" } || ! { var(req.fix_sender) "CLIENT1" }