docs: Add disclaimer for install scripts

docs/guides/sdk/install.md

@@ -1,7 +1,7 @@
 # Install
 
 The fastest and easiest way to install the Cosmos SDK binaries
-is to run [this script](https://github.com/cosmos/cosmos-sdk/blob/develop/scripts/install_sdk_ubuntu.sh) on a fresh Ubuntu instance. Similarly, you can run [this script](https://github.com/cosmos/cosmos-sdk/blob/develop/scripts/install_sdk_bsd.sh) on a fresh FreeBSD instance. Read the comments / instructions carefully (i.e., reset your terminal after running the script).
+is to run [this script](https://github.com/cosmos/cosmos-sdk/blob/develop/scripts/install_sdk_ubuntu.sh) on a fresh Ubuntu instance. Similarly, you can run [this script](https://github.com/cosmos/cosmos-sdk/blob/develop/scripts/install_sdk_bsd.sh) on a fresh FreeBSD instance. Read the scripts before running them to ensure no untrusted connection is being made, for example we're making curl requests to download golang. Also read the comments / instructions carefully (i.e., reset your terminal after running the script).
 
 Cosmos SDK can be installed to
 `$GOPATH/src/github.com/cosmos/cosmos-sdk` like a normal Go program:

scripts/install_sdk_bsd.sh

@@ -7,6 +7,11 @@
 # upon its completion, you must either reset
 # your terminal or run `source ~/.tcshrc`
 
+# This assumes your installing it through tcsh as root.
+# Change the relevant lines from tcsh to csh if your
+# installing as a different user, along with changing the
+# gopath.
+
 # change this to a specific release or branch
 set BRANCH=master