[FAB-8731] Clarify CLI cc install doc for node cc

This CR clarifies the usage of the path flag when installing a node
chaincode using the peer CLI.

Change-Id: I13a6a6aac5ee2c022d52ce04fdfc462f6b7a33cc
Signed-off-by: Will Lahti <wtlahti@us.ibm.com>
(cherry picked from commit 5bf93a8)

docs/source/commands/peerchaincode.md

@@ -121,7 +121,10 @@ The `peer chaincode install` command has the following command-specific flags:
 
   * `-p, --path <string>`
 
-    Path, relative to the GOPATH, to the chaincode that is being installed
+    Path to the chaincode that is being installed. For Golang (-l golang) chaincodes, this
+    is the path relative to the GOPATH. For Node.js (-l node) chaincodes, this is either the
+    absolute path or the relative path from where the install command is being
+    performed
 
   * `-v, --version <string>`
 
@@ -648,7 +651,7 @@ The `peer chaincode upgrade` command has the following command-specific flags:
 
   * `-P, --policy <string>`
 
-    Endorsement policy associated to this chaincode. By default fabric 
+    Endorsement policy associated to this chaincode. By default fabric
     will generate an endorsement policy equivalent to "any member from
     the organizations currently in the channel"