Document move to m4_ prefix

Author: j-woz

dev/conda/README.adoc

@@ -172,13 +172,13 @@ We restrict our M4 usage to:
 * `m4_include()`: does simple file insertion
 * `m4_ifelse()`: does conditional substitution +
 Syntax: `m4_ifelse(VALUE1, VALUE2, TEXT1)` ⇒ _if (VALUE1 == VALUE2) then insert TEXT1_
-* `getenv()`: substitutes in an environment variable value
+* `m4_getenv()`: substitutes in an environment variable value
 
-See `dev/conda/common.m4` for `getenv()` - this is a different script from the `common.m4' for the Turbine submit scripts due to newline requirements.
+See `dev/conda/common.m4` for `m4_getenv()` - this is a different script from the `common.m4' for the Turbine submit scripts due to Spack packaging requirements.
 
 Example:
 ----
-m4_ifelse(getenv(ENABLE_R),`1',m4_include(pkgs-R.yaml))
+m4_ifelse(m4_getenv(ENABLE_R),`1',m4_include(pkgs-R.yaml))
 ----
 means: if `$ENABLE_R == 1`, include file `pkgs-R.yaml` here.